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Title: ARRESTED DYNAMIC FAILURES UNDER BIAXIAL TENSION

Authors:
 [1];  [1];  [1]
  1. Los Alamos National Laboratory
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1242898
Report Number(s):
LA-UR-07-1715
DOE Contract Number:
AC52-06NA25396
Resource Type:
Conference
Resource Relation:
Conference: 2007 SOCIETY FOR EXPERIMENTAL MECHANICS ANNUAL CONFERENCE & EXPOSITION ; 200706 ; SPRINGFIELD
Country of Publication:
United States
Language:
English

Citation Formats

MASON, THOMAS A., MARTINEZ, MICHAEL E., and WARNER, DAVID K. ARRESTED DYNAMIC FAILURES UNDER BIAXIAL TENSION. United States: N. p., 2007. Web.
MASON, THOMAS A., MARTINEZ, MICHAEL E., & WARNER, DAVID K. ARRESTED DYNAMIC FAILURES UNDER BIAXIAL TENSION. United States.
MASON, THOMAS A., MARTINEZ, MICHAEL E., and WARNER, DAVID K. Wed . "ARRESTED DYNAMIC FAILURES UNDER BIAXIAL TENSION". United States. doi:. https://www.osti.gov/servlets/purl/1242898.
@article{osti_1242898,
title = {ARRESTED DYNAMIC FAILURES UNDER BIAXIAL TENSION},
author = {MASON, THOMAS A. and MARTINEZ, MICHAEL E. and WARNER, DAVID K.},
abstractNote = {},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Wed Mar 14 00:00:00 EDT 2007},
month = {Wed Mar 14 00:00:00 EDT 2007}
}

Conference:
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  • It has been well recognized that the fatigue failure characteristics of fiber reinforced composites under tension/torsion biaxial loading are different from those under uniaxial loading. In many cases, biaxial loads are proportionally applied to specimens and their loading path is shown as a straight line on the normal and shear stresses map. However, innumerable loading paths exist which give the same final stress state under non-proportional biaxial loading. It was revealed in the previous research of the authors that the difference in loading mode and sequence of shear stress under tension/torsion biaxial loading apparently affects the fatigue characteristics such asmore » stress-strain relation and fatigue life. Therefore, it is also anticipated that the fatigue failure characteristics of fiber reinforced composites are strongly influenced not only by loading mode and sequence but also by loading path under multi-axial loading. However, there are few studies on the effect of loading path on the fatigue characteristics including stress-strain response and microscopic internal damage accumulation for fiber reinforced composites. The objective of the present work is to show the effect of loading path on the fatigue of a plain-woven glass fabric polymer composite under tension/torsion biaxial loading. Three different loading paths are applied to the material including proportional loading.« less
  • The finite-difference computer program HEMP is used to simulate the crack-propagation phenomenon in two-dimensional ductile materials under truly dynamic biaxial loads. A comulative strain-damage criterion for the initiation of ductile fracture is used. To simulate crack propagation numerically, the method of equivalent free-surface boundary conditions and the method of artifical velocity are used in the computation. Centrally cracked rectangular aluminum bars subjected to constant-velocity biaxial loads at the edges are considered. Tensile and compressive loads in the direction of crack length are found, respectively, to increase and decrease directional instability in crack propagation, where the directional instability is characterized bymore » branching or bifurcation.« less
  • Dynamic equi-biaxial bulging of thin AerMet 100 alloy plates was studied. The plates were deformed using a gas-gun driven flyer plate test set-up at impact velocities between 1.0 and 2.0 km/sec. The results indicate that in addition to biaxial stretching (and thinning) of the plate, internal cavitation (spallation fracture) results from the complex wave interactions within the plate. No outward evidence of damage was observed at the lower velocities, in the range of 1.0-1.2 km/sec. Fine scale cracking of the plates was observed at impact velocity above approximately 1.4 km/sec. Complete specimen fracture, in the form of multiple petals andmore » pie-shaped fragments, was observed at impact velocity above 1.6 km/sec. Hydrodynamic computer code simulations were performed, prior to and in conjunction with the experiments, to aid in experiment design and interpretation of the experimental data.« less
  • Strength and stress-strain properties of plain woven glass fabric composites were measured under three different loading paths which gave the same final stress state. Thin-walled tubular specimens were used. In the present study, the progressive damage was focused. In all tests, acoustic emissions (AE) were measured for distinguishing damage accumulation such as debonding, matrix cracking and fiber breakage. Failed specimens were observed using an optical microscope. Based on the experimental results, a new yield criterion for glass fabric composites was proposed. Damage accumulation and its sequence were both affected by loading path. The S-S relations up to failure were affectedmore » by biaxial stress ratio {alpha} (the ratio between normal and shear stresses) and loading path. However, the strength did not depend on loading path. The material failure was governed by the final stress condition regardless the difference of loading path.« less
  • The material degradation and its mechanism of a plain woven glass fabric under tension/torsion biaxial cyclic loading were investigated. Thin-walled tubular specimens were used. Different types of loading sequence were applied to the specimens in order to estimate the effect of shear stress component on fatigue degradation of the composite under biaxial cyclic loading. All biaxial loads were proportionally applied to the specimens, but the number of torsion loading cycles and its direction (pulsating or alternate) were changed. Various wave forms were also used to estimate the effect of loading path. Loading path was changed but the final stress statemore » (tensile and shear stresses) was the same. Stress-strain relation and stiffness reduction were observed to evaluate the degree of fatigue damage. The experimental results show that the role of shear stress is important when the material degradation is dominated by the shear stress component although the effect of shear stress component on fatigue strength decreases with an increase of tensile stress component under tension/torsion biaxial loading. Loading sequence also affects more or less on the fatigue life. On the other hand, it is well estimated that the fatigue life is little dependent on loading path in the case of high cycle fatigue.« less