The influence of matrix and ultra-high-molecular-weight polyethylene (UHMWPE) components on the response of four UHMWPE composites to shock load

The dynamic responses of four varieties of ultra-high-molecular-weight polyethylene (UHMWPE) composites to mechanical shock perturbation are probed through plate-impact experimentation. The four composites—Dyneema® HB212, Dyneema® HB210, Tensylon®, and Tensylon® HSBD 30A—are chosen to allow a general comparison of the separate influences of matrix and UHMWPE fiber component properties on the dynamic response. Measurements of the Hugoniot reveal a combined influence of the matrix stiffness as well as the character of the UHMWPE fiber components. Hugoniot elastic limit and spall strength are not captured due to the low strength of the material. X-ray computed tomography scans of shock-recovered materials indicate delamination from release after shock load, resulting in a complete loss of spall strength. Differential scanning calorimetry measurements in Dyneema-based composites reveal an influence of the matrix stiffness on the crystallinity of the as-processed fibers likely resulting from differences in the ability of the matrix to confine fibers during consolidation. Greater fiber confinement is purported to result in a reduced degree of crystalline order within the fibers, which contributes to enhanced compressibility upon shock loading.