Bifurcation of collapse mode of thin-walled tube under oblique impact loading

2017 ◽  
Vol 2017 (0) ◽  
pp. G0300506
Author(s):  
Tsutomu UMEDA ◽  
Koji MIMURA
Keyword(s):  
Impact Loading ◽  
Oblique Impact ◽  
Collapse Mode ◽  
Thin Walled Tube ◽  
Thin Walled

scholarly journals Crushing response of circular thin-walled tube with non-propagating crack subjected to dynamic oblique impact loading

2019 ◽  
Vol 11 (1) ◽  
pp. 41-68 ◽  
Author(s):  
Chukwuemeke William Isaac
Keyword(s):  
Energy Absorption ◽  
Numerical Study ◽  
Structural Response ◽  
Oblique Impact ◽  
Absorption Capacity ◽  
Crushing Force ◽  
Propagating Crack ◽  
Thin Walled Tube ◽  
Thin Walled ◽  
Energy Absorbing

The dynamic oblique crushing of circular thin-walled tubes with the presence of non-propagating crack was investigated numerically. The material considered was strain rate sensitive with crack located at the distal end of the tube. Major crashworthiness parameters were obtained and the analysis of the structural response for idealized and finite element crushed thin-walled tubes was also carried out. The study shows that crack initiation on energy absorbing tubes increase their crushing force efficiency under oblique impact, decrease their crushing force efficiency under axial impact and reduce their crashworthiness performance such as the energy absorption capacity and specific energy absorption under axial and oblique impact. Results of the crashworthiness parameters, deformation modes, damage morphology, stress–strain relations, absorption energy characteristics and crushing force-displacement history were obtained. Furthermore, the numerical study reveals both the desirable and undesirable consequence of crack on the overall crashworthiness performance of energy absorbing circular thin-walled tubes.

Crushing Analysis of Tapered Ellipse Tubes Under Oblique Impact Loading

2016 ◽  
Author(s):  
Qiang Gao ◽  
Liangmo Wang ◽  
Yuanlong Wang ◽  
Fuxiang Guo ◽  
Zunzhi Zhang
Keyword(s):  
Cross Sections ◽  
Impact Loading ◽  
Oblique Impact ◽  
Nonlinear Finite Element ◽  
Element Analysis ◽  
Specific Energy Absorption ◽  
Crushing Force ◽  
Thin Walled ◽  
Energy Absorbing ◽  
Load Angle

In this paper, a class of axisymmetric thin-walled tubes with two types of geometries (straight and tapered) and four kinds of cross-sections (square, rectangle, circle, ellipse) are considered as energy absorbing components under oblique impact loading. The crash behavior of these tubes are first investigated by nonlinear finite element analysis through LS-DYNA. It is found that the tapered tubes has the better crashworthiness performance than the straight ones under oblique impact regarding both specific energy absorption (SEA) and peak crushing force (PCF). Among the tapered tubes, the tapered ellipse tube (TET) has the best crashworthiness performance. Then by calculating the overall SEA considering load angle uncertainty effect, it is found that the weighting factors for different load angles are critical for evaluating the crashworthiness performance of the tubes.

A Novel Origami Crash Box With Varying Profiles

2013 ◽  
Author(s):  
Jiayao Ma ◽  
Zhong You
Keyword(s):  
Numerical Simulation ◽  
Energy Absorption ◽  
Cross Sections ◽  
Peak Force ◽  
Geometric Imperfection ◽  
Axial Crushing ◽  
Collapse Mode ◽  
Thin Walled Tube ◽  
Thin Walled ◽  
Initial Peak

Crash boxes in automobiles are often made from thin-walled tubes. They are designed to absorb energy when subjected to axial crushing. In this paper we present a novel crash box known as the origami crash box. It is produced by pre-folding the surface of a thin-walled tube according to a developable origami pattern. The pre-folded surface serves both as a type of geometric imperfection to lower the initial peak force, and as a mode inducer to trigger a collapse mode that is more efficient in terms of energy absorption. Numerical simulation of quasi-static axial crushing of the origami crash box has shown that a new collapse mode deemed the completed diamond mode can be triggered in tubes with square, rectangular, and polygonal cross sections and tapered shapes, leading to both a substantial gain in overall energy absorption, while at the same time, a reduction in initial peak force.

NICROBRAZ 50

Alloy Digest ◽  
1994 ◽  
Vol 43 (8) ◽  
Keyword(s):  
Corrosion Resistance ◽  
Physical Properties ◽  
Honeycomb Structures ◽  
Thin Walled Tube ◽  
Thin Walled ◽  
Low Solubility

Abstract NICROBRAZ 50 is a low-melting, free-flowing filter metal for honeycomb structures and thin-walled tube assemblies. It has low solubility. This datasheet provides information on composition, physical properties, and hardness. It also includes information on corrosion resistance as well as joining. Filing Code: Ni-460. Producer or source: Wall Colmonoy Corporation.

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