Measuring Failure Stress of RTM6 Epoxy Resin under Purely Hydrostatic Tensile Stress using Constrained Tube Method

Transverse cracking in the bulk and at the free edge of thin-ply composites: Experiments and multiscale modelling

“…7is in good agreement with the experimental results obtained on very small samples[25]. The strain at onset of damage in tension c t was then defined considering an elastic offloading from the last point in the extended stress-strain curve.It can be observed that if the extended behaviour is considered, the hydrostatic strength calculated as proposed is in good agreement with both the void initiation failure criterion σ H ≥ σ ut /3 relating the hydrostatic strength σ H to the uniaxial strength σ ut , and previous experimental measurements, both discussed by Gross et al[27].Once the critical strain is reached, a linear softening, energy based regulari-sed damage model reduces the stiffness of the matrix elements. The damage variable SDEG is defined as the scalar stiffness degradation variable (Ductile damage model in Abaqus [28]).…”

A novel approach to consider triaxial tensile stresses within the framework of a failure criterion

“…As a result of the cooling, the epoxy resin contracts which was hindered by the adhesion of the epoxy resin to the walls of the quartz tube. The results show similar reduced strengths to those observed in the poker chip test [22].…”

“…For different resin systems, it was found that the hydrostatic tensile strength was dramatically lower than the uniaxial tensile strength (see Table 2). A different method was used by Gross et al [22]. Here, an epoxy resin was cooled from curing temperature inside a quartz tube.…”

“…A different method was used by Gross et al. [22]. Here, an epoxy resin was cooled from curing temperature inside a quartz tube.…”