DESIGN Chennai. 2 Assistant professor, Srm Institute of

Topic: ArtDesign
Sample donated:
Last updated: June 4, 2019

DESIGN AND DEVELOPMENT OF REAR UNDER RIDE PROTECTION DEVICE(RUPD) WITH IMPROVED ENERGY ABSORPTIONN Manikandan1and B Prabhakaran21 Assistant professor, Srm Institute of science andTechnology, Ramapuram, Chennai.

2 Assistant professor, Srm Institute of science and Technology,Ramapuram, Chennai.Email: [email protected],[email protected] Abstract: Every year thousands ofvehicle occupants are killed or injured due to road accidents. Out of which 8%are due to large truck accidents. Truck under ride accidents represents majorpart of the truck related accidents.

We Will Write a Custom Essay Specifically
For You For Only $13.90/page!


order now

Rear Under ride Protective Device(RUPD) ofthe truck is the main structure for absorbing the energy of collisions duringrear impact. It is essential to improve the energy absorption characteristicsof RUPD due to poor road conditions and primitive passenger safety systems inIndia. The current project is aimed at improving the energy absorption capacityof RUPD, for that two different designs were made and analyzed for improveddeformation and strain energy  storingcapacity.

The analysis was carried out in ANSYS and results were evaluatedbetween two models for improvement in the deformation and strain energy storingcapacity.Keywords:RUPD, Impact energy,1.Introduction                It is very common incident that during the accident apassenger vehicle going under the heavy commercial vehicle either from therear, front or side. During collision, there is a risk that the passengervehicle will penetrate under ( run under) the front or rear part of the truckand thus there are great chances of fatal injuries to the occupants of thepassenger car.

According to the study supported by Natural science foundationof china and the Natural science foundation of Hunan, it is reported that totalof 92 rear end crashes between trucks on expressways were collected during theyear 2010 to 2016 1. The Under ride protection device is an attachment fixedto the heavy commercial vehicle which will avoid the under running of thepassenger vehicle at the rear side of a heavy vehicle and further reduces thechances of severe fatal injuries to the passenger vehicle occupant. Most of thehead injuries and consequent fatalities occur during a rear ride of thepassenger vehicle.

The rear under run protection device  prevents the vehicles from being wedged underthe chassis during accidental crashes which significantly increases the safetyof occupants. The significant factor in the rear under production device is ithas resistance to loading forces acting along or parallel to the vehiclelongitudinal axis. This necessitates the requirement of a proper design withimproved energy absorption. Based on the standard IS 14812-2005,the deformation in the RUPD bar and strain energy can be predicted for failurebefore the physical test using Finite element analysis using ANSYS. Based onthe Indian Standard the physical test scenario is developed in the Finiteelement modeling to avoid product development for experimental test and toreduce cost involvement in design development 2.2.Finite Element Modeling     The model created and used for the Finiteelement analysis is corrugated steel plate instead the commercially used SolidRUPD in circular cross section.

The Corrugated steel device designed in amanner to absorb more impact energy and to offer more deformation.                      Fig.1: FE modelling of RUPD structureFig.2:Cross-Section ofthe designed RUPD device3.

Boundaryand Loading Condition   The chassis member are constrained in alldegrees of freedom. They are very critical member and subjected deformationunder a severe case. The load conditions are applied as per the standard of IS 14812-2005.

Fig.3: Model shows the Boundary andloading conditionThe Load P1=25000 N, P2=100000 N, and P3 =25000 N are considered as steady load because the analysisis carried under static structural condition.4. Material properties of RUPD Bar    TheRUPD device is assigned with the following material properties for designvalidationTable.1: RUPD barmaterial properties Material Tensile strength MPa Yield strength MPa Poison Ratio Young’s Modulus GPa Mild Steel 440 370 0.29 205 Copper 220 70 0.36 130 BSK 46 640 500 0.31 210  It is clear from theproperties of materials mentioned in Table.

1 that BSK 46 has more tensile,yield and modulus value than the other materials in the list4.Result and Discussion4.1.Design Validation    The model shown inFig.1 is compared with RUPD with Copper stiffener shown in Fig 4. The resultshows that the change in the design has significant effect on the deformationcharacteristics and strain energy. It is clear from the result shown in Table.

2that the design of RUPD with Corrugated structure has more energy carryingcapacity than the RUPD with copper stiffener. The same corrugated steel RUPD ischecked for  different material for anyenhanced performance (i.e. deformation) or energy absorption capability.Fig.4: RUPD with Copper StiffenerTable.2: Comparison between RUPD withCopper Stiffener and RUPD with Corrugated Structure.

Model Material Total Deformation mm RUPD with Copper Stiffener Mild steel 1.262 RUPD with Corrugated structure Mild Steel 5.272  Fig.5:Deformation plot of RUPD withCopper StiffenerFig.6: Deformation plot of RUPD withCorrugated structure4.2.Effectof material properties on the RUPD bar      From the table.

2, It isclear that RUPD with corrugated structure has more deformation than the RUPDwith copper stiffener. In the next comparison, the ultimate tensile strengthand yield strength of BSK 46 is higher than mild steel as it is depicted in theTable.1. It clear explains that there will be improvement in the deformationand strain energy characteristics of RUPD bar. But the strain energy storingcapacity of RUPD bar for BSK-46 material doesn’t show a significant rise in theparameter with the Mild steel material as it is depicted in the Table.

3. Table.3: Comparison of Mild steel and BSK46 material property on the RUPD with Corrugated structure.

Model material Total deformation mm Strain Energy mJ RUPD with Corrugated structure Mild steel       5.272   2410.7 BSK 46 6.4013 2465.3  Percentage of variationbetween BSK 46 and mild steel in deformation and strain energy is 17% and 2.2%respectively. It is clear that the change in material property on the designedmodel for the same boundary and loading condition does not have any significanteffect on the strain storing capacity but produces a significant effect on thedeformation parameter.

Fig.7: Strain energy plot of RUPD with BSK-46steel propertyFig.8: Strain energy plot of RUPD with Mildsteel property 5.Conclusion    Inthis study, two different models of RUPD bar were analyzed for same boundaryand loading conditions and two different material properties were assigned forthe model to identify the effect of material property in the design. It isclear from the analyze the RUPD with corrugated structure has more deformationand energy carrying capacity than the RUPD with copper stiffeners.

Next, theeffect of material property on the designed model have a significant change inthe deformation but not in  strain energyparameter. It shows a variation of 17% and only 2.2% of variation indeformation and strain energy respectively between  BSK-46 and mild steel.

The change in thedesign of RUPD bar has most significant effect on the deformation parameter. Itshows 76% of variation between the two proposed design. So, It is proven thatthe corrugated structure can be used as solution for improved energyabsorption. It can be used for the practical heavy vehicles like Heavyduty trucks, Trailers, Agricultural tractor –trailers, Short haul trucks, Roadtrains etc.

. Whenused in above vehicles, the improved RUPD will play a major role in reducingthe transfer of impact forces to the occupants of smaller vehicles subjected torear under ride crash thereby saving many invaluable lives.        DESIGN AND DEVELOPMENT OF REAR UNDER RIDE PROTECTION DEVICE(RUPD) WITH IMPROVED ENERGY ABSORPTIONN Manikandan1and B Prabhakaran21 Assistant professor, Srm Institute of science andTechnology, Ramapuram, Chennai.2 Assistant professor, Srm Institute of science and Technology,Ramapuram, Chennai.Email: [email protected]

com,[email protected] Abstract: Every year thousands ofvehicle occupants are killed or injured due to road accidents. Out of which 8%are due to large truck accidents. Truck under ride accidents represents majorpart of the truck related accidents. Rear Under ride Protective Device(RUPD) ofthe truck is the main structure for absorbing the energy of collisions duringrear impact. It is essential to improve the energy absorption characteristicsof RUPD due to poor road conditions and primitive passenger safety systems inIndia. The current project is aimed at improving the energy absorption capacityof RUPD, for that two different designs were made and analyzed for improveddeformation and strain energy  storingcapacity.

The analysis was carried out in ANSYS and results were evaluatedbetween two models for improvement in the deformation and strain energy storingcapacity.Keywords:RUPD, Impact energy,1.Introduction                It is very common incident that during the accident apassenger vehicle going under the heavy commercial vehicle either from therear, front or side. During collision, there is a risk that the passengervehicle will penetrate under ( run under) the front or rear part of the truckand thus there are great chances of fatal injuries to the occupants of thepassenger car. According to the study supported by Natural science foundationof china and the Natural science foundation of Hunan, it is reported that totalof 92 rear end crashes between trucks on expressways were collected during theyear 2010 to 2016 1.

The Under ride protection device is an attachment fixedto the heavy commercial vehicle which will avoid the under running of thepassenger vehicle at the rear side of a heavy vehicle and further reduces thechances of severe fatal injuries to the passenger vehicle occupant. Most of thehead injuries and consequent fatalities occur during a rear ride of thepassenger vehicle. The rear under run protection device  prevents the vehicles from being wedged underthe chassis during accidental crashes which significantly increases the safetyof occupants. The significant factor in the rear under production device is ithas resistance to loading forces acting along or parallel to the vehiclelongitudinal axis. This necessitates the requirement of a proper design withimproved energy absorption. Based on the standard IS 14812-2005,the deformation in the RUPD bar and strain energy can be predicted for failurebefore the physical test using Finite element analysis using ANSYS.

Based onthe Indian Standard the physical test scenario is developed in the Finiteelement modeling to avoid product development for experimental test and toreduce cost involvement in design development 2.2.Finite Element Modeling     The model created and used for the Finiteelement analysis is corrugated steel plate instead the commercially used SolidRUPD in circular cross section. The Corrugated steel device designed in amanner to absorb more impact energy and to offer more deformation.                      Fig.1: FE modelling of RUPD structureFig.2:Cross-Section ofthe designed RUPD device3.

Boundaryand Loading Condition   The chassis member are constrained in alldegrees of freedom. They are very critical member and subjected deformationunder a severe case. The load conditions are applied as per the standard of IS 14812-2005.

Fig.3: Model shows the Boundary andloading conditionThe Load P1=25000 N, P2=100000 N, and P3 =25000 N are considered as steady load because the analysisis carried under static structural condition.4.

Material properties of RUPD Bar    TheRUPD device is assigned with the following material properties for designvalidationTable.1: RUPD barmaterial properties Material Tensile strength MPa Yield strength MPa Poison Ratio Young’s Modulus GPa Mild Steel 440 370 0.29 205 Copper 220 70 0.36 130 BSK 46 640 500 0.31 210  It is clear from theproperties of materials mentioned in Table.

1 that BSK 46 has more tensile,yield and modulus value than the other materials in the list4.Result and Discussion4.1.Design Validation    The model shown inFig.1 is compared with RUPD with Copper stiffener shown in Fig 4. The resultshows that the change in the design has significant effect on the deformationcharacteristics and strain energy. It is clear from the result shown in Table.2that the design of RUPD with Corrugated structure has more energy carryingcapacity than the RUPD with copper stiffener.

The same corrugated steel RUPD ischecked for  different material for anyenhanced performance (i.e. deformation) or energy absorption capability.Fig.

4: RUPD with Copper StiffenerTable.2: Comparison between RUPD withCopper Stiffener and RUPD with Corrugated Structure. Model Material Total Deformation mm RUPD with Copper Stiffener Mild steel 1.262 RUPD with Corrugated structure Mild Steel 5.272  Fig.

5:Deformation plot of RUPD withCopper StiffenerFig.6: Deformation plot of RUPD withCorrugated structure4.2.Effectof material properties on the RUPD bar      From the table.2, It isclear that RUPD with corrugated structure has more deformation than the RUPDwith copper stiffener. In the next comparison, the ultimate tensile strengthand yield strength of BSK 46 is higher than mild steel as it is depicted in theTable.

1. It clear explains that there will be improvement in the deformationand strain energy characteristics of RUPD bar. But the strain energy storingcapacity of RUPD bar for BSK-46 material doesn’t show a significant rise in theparameter with the Mild steel material as it is depicted in the Table.3. Table.3: Comparison of Mild steel and BSK46 material property on the RUPD with Corrugated structure. Model material Total deformation mm Strain Energy mJ RUPD with Corrugated structure Mild steel       5.

272   2410.7 BSK 46 6.4013 2465.3  Percentage of variationbetween BSK 46 and mild steel in deformation and strain energy is 17% and 2.2%respectively.

It is clear that the change in material property on the designedmodel for the same boundary and loading condition does not have any significanteffect on the strain storing capacity but produces a significant effect on thedeformation parameter.Fig.7: Strain energy plot of RUPD with BSK-46steel propertyFig.8: Strain energy plot of RUPD with Mildsteel property 5.Conclusion    Inthis study, two different models of RUPD bar were analyzed for same boundaryand loading conditions and two different material properties were assigned forthe model to identify the effect of material property in the design.

It isclear from the analyze the RUPD with corrugated structure has more deformationand energy carrying capacity than the RUPD with copper stiffeners. Next, theeffect of material property on the designed model have a significant change inthe deformation but not in  strain energyparameter. It shows a variation of 17% and only 2.2% of variation indeformation and strain energy respectively between  BSK-46 and mild steel.

The change in thedesign of RUPD bar has most significant effect on the deformation parameter. Itshows 76% of variation between the two proposed design. So, It is proven thatthe corrugated structure can be used as solution for improved energyabsorption. It can be used for the practical heavy vehicles like Heavyduty trucks, Trailers, Agricultural tractor –trailers, Short haul trucks, Roadtrains etc.. Whenused in above vehicles, the improved RUPD will play a major role in reducingthe transfer of impact forces to the occupants of smaller vehicles subjected torear under ride crash thereby saving many invaluable lives.                  

x

Hi!
I'm Mia!

Don't know how to start your paper? Worry no more! Get professional writing assistance from me.

Check it out