Multiple reinforcements composite as a lightweight helmet material in order to absorb impact energy due to collision

2018 ◽  
Author(s):  
Wajan Berata ◽  
Sutikno ◽  
Ahmat Safa’at ◽  
Joko Ade Nugroho
Keyword(s):  
Impact Energy ◽  
Absorb Impact Energy

Ron Resch Origami Pattern Inspired Energy Absorption Structures

2018 ◽  
Vol 86 (1) ◽  
Author(s):  
Zhe Chen ◽  
Tonghao Wu ◽  
Guodong Nian ◽  
Yejie Shan ◽  
Xueya Liang ◽  
...  
Keyword(s):  
Numerical Simulations ◽  
Energy Absorption ◽  
Impact Energy ◽  
Plastic Hinge ◽  
Honeycomb Structure ◽  
Experimental Characterization ◽  
Collapse Mode ◽  
Thin Walled ◽  
Force Reduction ◽  
Absorb Impact Energy

Energy absorption structures are widely used in many scenarios. Thin-walled members have been heavily employed to absorb impact energy. This paper presents a novel, Ron Resch origami pattern inspired energy absorption structure. Experimental characterization and numerical simulations were conducted to study the energy absorption of this structure. The results show a new collapse mode in terms of energy absorption featuring multiple plastic hinge lines, which lead to the peak force reduction and larger effective stroke, as compared with the classical honeycomb structure. Overall, the Ron Resch origami-inspired structure and the classical honeycomb structure are quite complementary as energy absorption structures.

3D printed geometrically tessellated sheets with origami-inspired patterns

2021 ◽  
pp. 0021955X2110618
Author(s):  
Anastasia L. Wickeler ◽  
Hani E. Naguib
Keyword(s):  
Impact Energy ◽  
Single Layer ◽  
Impact Testing ◽  
Impact Loads ◽  
Geometrical Complexity ◽  
Impact Forces ◽  
3D Printed ◽  
The Impact ◽  
Multiple Configurations ◽  
Absorb Impact Energy

This study demonstrates that the impact energy absorption capabilities of flexible sheets can be significantly enhanced by implementing tessellated designs into their structure. Configurations of three tessellated geometries were tested; they included a triangular-based, a rectangular-based, and a novel square-based pattern. Due to their geometrical complexity, multiple configurations of these tessellations were printed from a rubber-like material using an inkjet printer with two different thicknesses (2 and 4 mm), and their ability to absorb impact energy was compared to an unpatterned inkjet-printed sheet. In addition, the effect of multi-sheets stacking was also tested. Due to the tailored structure, the impact testing showed that the single-layer sheets were more effective at absorbing impact loads, and experience less deformation, than their two-layer counterparts. The 4 mm thick tessellated patterns were most effective at absorbing impact loads; all three thick patterns measured about 40% lower impact forces transferred to the base of the samples compared to the unpatterned counterparts.

scholarly journals Conceptual Design of a Roller Obstacle Deflector

2020 ◽  
Vol 9 (11) ◽  
pp. 217-224
Keyword(s):  
Conceptual Design ◽  
Impact Energy ◽  
Impact Force ◽  
Ansys Software ◽  
Software Simulation ◽  
Reaction Forces ◽  
Living Organisms ◽  
The Impact ◽  
Animal Category ◽  
Absorb Impact Energy

An Obstacle Deflector is a device mounted in front of the trains to sweep away the obstacle off the track or absorb impact energy to prevent derailment. On considering the same concept which sweeps the obstacle, I have designed a device that sweeps away living obstacles (animals, Humans) from the tracks with life expectancy. Many animals are killed over the tracks in regular train accidents. Based on this issue, here my project discusses with the conceptual design of a roller obstacles deflector that absorbs the impact energy on collision and sideways the obstacle using roller based polyethylene rollers applied in front of the train. The cushioning effect designed for the device helps to reduce the impact force when Train hits the living obstacles (Human, cow and elephant) at speed of 30km/hr. or 8111 mm/s., With a load of 50 Tonne. As per study, human pain can be measured in Del (Dolorimeter) which explains that the maximum limit of pain average human being can withstand is 45 Del. But, breaking of a bone is almost equals to 57 Del. Some studies say Del is equal to 1403.508 N forces. By this data and using the reaction forces resulted at the time of clash in Ansys software simulation, we can state the amt. of pain (in terms of DEL) to some living organisms and can conclude the functionality of the device to save the life. This design works for the limited animal category based upon size and weight of the animal. This design works under the limited speed and with limited load to safeguard the animals and humans on the track. This design does not impact on the existing safety conditions of the railways as it’s absorb the impact up to limited extend. The modeling is done using CATIA. The explicit dynamics of impact is done with ANSYS

Optimization Analysis on the Crashworthiness of Light Aircrafts

2015 ◽  
Vol 5 (3) ◽  
pp. 1-23
Author(s):  
Pu-Woei Chen ◽  
Yung-Yun Chen
Keyword(s):  
Topology Optimization ◽  
Impact Energy ◽  
Strain Energy ◽  
Original Model ◽  
Model Structure ◽  
Optimal Model ◽  
Safety Zone ◽  
Optimization Analysis ◽  
Absorb Impact Energy ◽  
Large Aircraft

To protect passengers, large aircraft are equipped with multiple mechanisms to absorb impact energy during a crash. However, light aircraft rely only on the cabin structure to withstand the compression and energy generated during a crash. This study performed a topology optimization analysis on the model structure by using Abaqus/optimization and used strain energy as the objective function and cabin volume as a constraint to develop the optimal model. Subsequently, this work performed dynamic crash simulations based on the optimal and original models by using Abaqus/explicit. Compared with the original model, the optimal model yielded a 12% increase in the safety zone of the diagonal beams, a 13% increase in the X-direction safety zone, and a 10% increase in the overall safety zone. The results confirm that topology optimization can be used to effectively improve the crashworthiness of light aircraft.

Comparing fast inductive tempering and conventional tempering: Effects on microstructure and mechanical properties

2018 ◽  
Vol 115 (4) ◽  
pp. 407 ◽  
Author(s):  
Annika Eggbauer Vieweg ◽  
Gerald Ressel ◽  
Peter Raninger ◽  
Petri Prevedel ◽  
Stefan Marsoner ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Impact Energy ◽  
Charpy Impact ◽  
Heat Treating ◽  
Processing Route ◽  
High Heating Rate ◽  
Heating Rates ◽  
High Heating ◽  
Tempering Treatment ◽  
Carbide Distribution

Induction heating processes are of rising interest within the heat treating industry. Using inductive tempering, a lot of production time can be saved compared to a conventional tempering treatment. However, it is not completely understood how fast inductive processes influence the quenched and tempered microstructure and the corresponding mechanical properties. The aim of this work is to highlight differences between inductive and conventional tempering processes and to suggest a possible processing route which results in optimized microstructures, as well as desirable mechanical properties. Therefore, the present work evaluates the influencing factors of high heating rates to tempering temperatures on the microstructure as well as hardness and Charpy impact energy. To this end, after quenching a 50CrMo4 steel three different induction tempering processes are carried out and the resulting properties are subsequently compared to a conventional tempering process. The results indicate that notch impact energy raises with increasing heating rates to tempering when realizing the same hardness of the samples. The positive effect of high heating rate on toughness is traced back to smaller carbide sizes, as well as smaller carbide spacing and more uniform carbide distribution over the sample.

N-A-XTRA M800

Alloy Digest ◽  
2016 ◽  
Vol 65 (11) ◽  
Keyword(s):  
Fracture Toughness ◽  
Yield Strength ◽  
Structural Steel ◽  
Tensile Properties ◽  
Impact Energy ◽  
Heat Treating ◽  
Service Temperature ◽  
Minimum Yield ◽  
Minimum Impact

Abstract N-A-XTRA M800 is a quenched and tempered structural steel produced as heavy plates. N-A-XTRA steel can be supplied in six different grades with a minimum yield strength of 550, 620, 700 and 800 MPa (79.8, 89.9, 101.5 and 116.0 ksi). Some grades are delivered with different toughness properties. This last quality is for low service temperature with minimum impact energy at -40 deg C (-40 deg F) for grade N-A-XTRA M in a thickness range from 3 to 120 mm (0.118 to 4.724 in.). This datasheet provides information on composition and tensile properties as well as fracture toughness. It also includes information on forming, heat treating, and joining. Filing Code: SA-771. Producer or source: ThyssenKrupp Steel Europe AG.

N-A-XTRA M620

Alloy Digest ◽  
2016 ◽  
Vol 65 (4) ◽  
Keyword(s):  
Fracture Toughness ◽  
Yield Strength ◽  
Structural Steel ◽  
Tensile Properties ◽  
Impact Energy ◽  
Heat Treating ◽  
Service Temperature ◽  
Minimum Yield ◽  
Minimum Impact

Abstract N-A-XTRA M620 is a quenched and tempered structural steel produced as heavy plates. N-A-XTRA steel can be supplied in six different grades with a minimum yield strength of 550, 620, and 700 MPa (79.8, 89.9, and 101.5 ksi). Some grades are delivered with different toughness properties. This quality shown in this datasheet is for low service temperature with minimum impact energy at -40 deg C (-40 deg F) for grade N-A-XTRA M in a thickness range from 3 to 120 mm (0.118 to 4.724 in.). This datasheet provides information on composition and tensile properties as well as fracture toughness. It also includes information on forming, heat treating, and joining. Filing Code: SA-746. Producer or source: ThyssenKrupp Steel Europe AG.

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