Experimental Results in Support of Simulating Progressive Crush in Carbon-Fiber Textile Composites

Axial crush simulation of braided carbon tubes using MAT58 in LS-DYNA

“…Fig. 3 plots a set of compressive stress-strain curves measured in [32]. These data reveal that the braided composite had retained a significant fraction of its load carrying capacity after having reached the commonly defined failure strength, particularly under compressive loading.…”

“…To authors' best knowledge, the work by DeTeresa et al [32] at the Lawrence Livermore National Lab (LLNL) was the first to generate damage data using un-notched specimens as in a material test on fabric composites. Using LLNL data in MAT58 of LS-DYNA, we obtained encouraging results in recent attempts in tube crush simulations.…”

“…To support the constitutive model development for composite tube crush applications, DeTeresa et al [32] measured the socalled ''total stress-strain responses'' of a braided carbon composite under tensile and compressive loading. The flat plaques used in the study were 0/730 tri-axial braid manufactured using resin transfer molding.…”

“…DeTeresa et al [32] also measured the total stress-strain curves for off-axis angles and 901 specimens at an intermediate strain rate of 1/s. They reported that the strengths were about 30% higher than those measured in quasi-static tests.…”

“…Table 1 provides the mechanical properties of the tri-axial braided composites. Table 2 lists the subset of data relevant to that needed for MAT58 extracted from the results of [32]. It shows that for the braided composite tested at LLNL, the SLIMi values are between 0.3 and 0.5.…”