PRE-STRAINED COMPOSTIE TEST COUPONS

摘要

A composite test coupon (200) includes a plurality of plies. The plurality of plies include first ply layers (208) and second ply layers (210). The first ply layers (208) have first fibers and a substantially uniform matrix material associated with the first fibers. The second ply layers (210) have second fibers and a pre-stressed matrix material associated with the second fibers. The first fibers are oriented in a first direction, and the second fibers are oriented in a second direction that is different from the first direction. The pre-stressed matrix material includes stress induced cracks between the second fibers of each of the second ply layers (210).