Comparative study on energy absorbing behavior of stiff and flexible composites under low velocity impact

2019 ◽  
Author(s):  
Vishwas Mahesh ◽  
Sharnappa Joladarashi ◽  
Satyabodh M. Kulkarni
Keyword(s):  
Comparative Study ◽  
Low Velocity Impact ◽  
Low Velocity ◽  
Velocity Impact ◽  
Flexible Composites ◽  
Energy Absorbing

Response and failure modes of biaxial warp-knitted flexible composite subject to low-velocity impact

2021 ◽  
pp. 152808372110154
Author(s):  
Ziyu Zhao ◽  
Tianming Liu ◽  
Pibo Ma
Keyword(s):  
Impact Energy ◽  
Linear Density ◽  
Failure Modes ◽  
Impact Response ◽  
Low Velocity Impact ◽  
Minor Effect ◽  
Low Velocity ◽  
Velocity Impact ◽  
Flexible Composites ◽  
The Impact

In this paper, biaxial warp-knitted fabrics were produced with different high tenacity polyester linear density and inserted yarns density. The low-velocity impact property of flexible composites made of polyurethane as matrix and biaxial warp-knitted fabric as reinforcement has been investigated. The effect of impactor shape and initial impact energy on the impact response of flexible composite is tested. The results show that the initial impact energy have minor effect on the impact response of the biaxial warp-knitted flexible composites. The impact resistance of flexible composite specimen increases with the increase of high tenacity polyester linear density and inserted yarns density. The damage morphology of flexible composite materials is completely different under different impactor shapes. The findings have theoretical and practical significance for the applications of biaxial warp-knitted flexible composite.

Influence of Material on Automotive Crash-Box Crashworthiness Subjected to Low Velocity Impact

2013 ◽  
Vol 655-657 ◽  
pp. 169-172
Author(s):  
Yan Jie Liu ◽  
Chun Yan Xia ◽  
Lin Ding ◽  
Chun Hua Liu
Keyword(s):  
Energy Absorption ◽  
Maximum Energy ◽  
Low Velocity Impact ◽  
Fe Model ◽  
Body Parts ◽  
Low Velocity ◽  
Velocity Impact ◽  
Thin Walled Tube ◽  
The Difference ◽  
Energy Absorbing

Crash-box equipped at the front end of a car, is one of the most important automotive parts for crash energy absorption. In case of frontal crash accident, it is expected to be collapsed with absorbing crash energy prior to other body parts so that the damage of the main cabin frame is minimized and passengers may be saved. Crash-box usually was made a mental thin walled tube. In the paper, automobile crash-box at low-velocity impact was studied by using Finite Element Method. The FE model of the tube was validated by comparing the experimental results and FE model results. Results show that on average the difference of these was within 10％.The good correlation of results obtained show that the numerical analyses are reliable. Crash-box of carbon steel and aluminum alloy materials are compared, it indicates that the peak impact force and maximum energy absorption have certain effect to energy-absorbing component with different materials.

Effects of needle-punched nonwoven structure on the properties of sandwich flexible composites under static loading and low-velocity impact

2017 ◽  
Vol 51 (8) ◽  
pp. 1045-1056 ◽  
Author(s):  
Ruosi Yan ◽  
Shih-Yu Huang ◽  
Chen-Hung Huang ◽  
Chien-Teng Hsieh ◽  
Ching-Wen Lou ◽  
...  
Keyword(s):  
Static Loading ◽  
Nonwoven Fabric ◽  
Low Velocity Impact ◽  
Low Velocity ◽  
Velocity Impact ◽  
Flexible Composites ◽  
Needle Punching ◽  
Flexible Foam ◽  
The Impact ◽  
Fiber Connection

The current study fabricated nylon/high-resilience bonding polyester (HRPET) nonwoven fabric with various needle-punching parameters and investigated the effect of these variations on the response of high-density flexible foam under static loading and low-velocity impact. The needle-punching depth and frequency are selected as variations. The HRPET fiber generates bonding-points when being thermally treated, which provides resilience properties on the sandwich flexible composites. The results find a substantial relationship between the temperature of thermal treatment and the absorption of low-velocity impact energy which is mainly because of the increase of fiber connection force. The impact force is eliminated by 8255 N at most. Needle-punching depth contributes to resistance to static loading and the highest resistance was 2043 N.

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