Crushing and crashing of tubes with implicit time integration

Kazancı, Zafer; Bathe, Klaus‐Jürgen

doi:10.1016/j.ijimpeng.2011.10.003

Cited by 50 publications

(23 citation statements)

References 27 publications

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“…Different industrial sectors such as the automotive (Rusinek et al, 2008;Kazanci and Bathe, 2012), aeronautical (Karagiozova and Mines, 2007;Varas et al, 2009), naval (Wang et al, 2008;Ehlers, 2010) or manufacturing (Miguélez et al, 2009;Verleysen et al, 2011) require quick and accurate modeling of systems to optimize design parameters, accounting for impact loads. The rapid progress in computational mechanics permits to simulate solids and structures undergoing high strain rates.…”

Section: Introductionmentioning

confidence: 99%

Dynamic tensile necking: Influence of specimen geometry and boundary conditions

Osovski

Rittel

Rodríguez-Martínez

et al. 2013

Mechanics of Materials

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a b s t r a c tThis paper examines the effects of sample size and boundary conditions on the necking inception and development in dynamically stretched steel specimens. For that task, a coordinated systematic experimental-numerical work on the dynamic tensile test has been conducted. Experiments were performed using a tensile Kolsky apparatus for impact velocities ranging from 10 to 40 m/s. Three different sample-gauge lengths -7, 30 and 50 mmwere considered for which the cross section diameter is 3.4 mm. The experiments revealed that the specimens' ductility to fracture depends on strain rate and sample length. Furthermore it was observed that, for those specimens having gauge lengths of 30 and 50 mm, the necking location varies with impact velocity. Numerical simulations of the dynamic tensile tests were carried out in order to characterize the dynamics of neck inception and development. For each specimen calculated, three types of boundary conditions were used, all of which match the experimentally measured strain-rate. It was pointed out that, while boundary conditions hardly affect the calculated stress-strain characteristics, they strongly affect the wave propagation dynamics in the specimen thus dictating the necking location.

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Section: Introductionmentioning

confidence: 99%

Dynamic tensile necking: Influence of specimen geometry and boundary conditions

Osovski

Rittel

Rodríguez-Martínez

et al. 2013

Mechanics of Materials

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“…Accurate knowledge of those properties is usually required in different engineering applications such as aeronautical [1,2], automotive [3,4], naval [5,6] and manufacturing [7,8], where service conditions involve large strains at high strain rates.…”

Section: Introductionmentioning

confidence: 99%

Finite element analysis of AISI 304 steel sheets subjected to dynamic tension: The effects of martensitic transformation and plastic strain development on flow localization

Rodríguez-Martínez

Rittel

Zaera

et al. 2013

International Journal of Impact Engineering

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b s t r a c tThe paper presents a finite element study of the dynamic necking formation and energy absorption in AISI 304 steel sheets. The analysis emphasizes the effects of strain induced martensitic transformation (SIMT) and plastic strain development on flow localization and sample ductility. The material behavior is described by a constitutive model proposed by the authors which includes the SIMT at high strain rates. The process of martensitic transformation is alternatively switched on and off in the simulations in order to highlight its effect on the necking inception. Two different initial conditions have been applied: specimen at rest which is representative of a regular dynamic tensile test, and specimen with a prescribed initial velocity field in the gauge which minimizes longitudinal plastic wave propagation in the tensile specimen. Plastic waves are found to be responsible for a shift in the neck location, may also mask the actual constitutive performance of the material, hiding the expected increase in ductility and energy absorption linked to the improved strain hardening effect of martensitic transformation. On the contrary, initializing the velocity field leads to a symmetric necking pattern of the kind described in theoretical works, which reveals the actual material behavior. Finally the analysis shows that in absence of plastic waves, and under high loading rates, the SIMT may not further increase the material ductility.

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“…The concept of a superfolding element was introduced by Wierzbicki and Abramowicz [5] to better understand the crushing mechanics of thin-walled structures. With the advancement in computing power and the numerical implementation of finite element methods in the last two decades, considerable work has been done to create equivalent numerical models for tube crushing and their validation with experimental tests [6,7,8,9]. With the help of advanced nonlinear software like LS-DYNA and ABAQUS, results from numerical models of axial and oblique loadings of thin-walled structures sufficiently match experimental results.…”

Section: Introductionmentioning

confidence: 99%

Design of progressively folding thin-walled tubular components using compliant mechanism synthesis

Bandi

Detwiler

Schmiedeler

et al. 2015

Thin-Walled Structures

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This work introduces a design method for the progressive collapse of thinwalled tubular components under axial and oblique impacts. The proposed design method follows the principles of topometry optimization for compliant mechanism design in which the output port location and direction determine the folding (collapse) mode. In this work, the output ports are located near the impact end with a direction that is perpendicular to the component's longitudinal axis. The topometry optimization is achieved with the use of hybrid cellular automata for thin-wall structures. The result is a complex enforced buckle zone design that acts as a triggering mechanism to (a) initiate a specific collapse mode from the impact end, (b) stabilize the collapse process, and (c) reduce the peak force. The enforced buckle zone in the end portion of the tube also helps to avoid or delay the onset of global bending during an oblique impact with load angles higher than a critical value, which otherwise adversely affects the structure's capacity for load-carrying and energy absorption. The proposed design method has the potential to dramatically improve thin-walled component crashworthiness.Keywords: Thin-walled square tubes, progressive buckling, compliant mechanisms, topometry design, structural optimization, hybrid cellular automata * Corresponding Author Preprint submitted to Thin-Walled Structures June 20, 2015 This is the author's manuscript of the article published in final edited form as: Bandi, P., Detwiler, D., Schmiedeler, J. P., & Tovar, A. (2015). Design of progressively folding thin-walled tubular components using compliant mechanism synthesis. Thin-Walled Structures, 95, 208-220. http://dx

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Crushing and crashing of tubes with implicit time integration

Cited by 50 publications

References 27 publications

Dynamic tensile necking: Influence of specimen geometry and boundary conditions

Dynamic tensile necking: Influence of specimen geometry and boundary conditions

Finite element analysis of AISI 304 steel sheets subjected to dynamic tension: The effects of martensitic transformation and plastic strain development on flow localization

Design of progressively folding thin-walled tubular components using compliant mechanism synthesis

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