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Characterization of microscopic damage due to low-velocity and high-velocity impact in CFRP with toughened interlayers

机译:带有增韧夹层的CFRP中低速和高速冲击导致的微观损伤的表征

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In this paper the low-velocity and high-velocity impact damage in a carbon fiber reinforced plastic (CFRP) laminate with toughened interlayers was experimentally characterized. The low-velocity impact test was carried out by using a guided drop weight system while the high-velocity impact test was conducted by using a high-velocity impact testing machine. The damage in the laminate was then observed using optical microscopy and soft X-ray radiography. It was revealed from the observation that microscopic damage state and damage area varied with the impact velocity. The variation is ascribed to the fact that the low-velocity impact causes global deformation while the high-velocity impact energy is absorbed mainly by damage due to local deformation. Although the toughened interlayers suppress delamination for low impact energy, the high interlaminar fracture toughness sometimes causes the transition of interlaminar delamination to intralaminar one.
机译:本文通过实验表征了具有增韧夹层的碳纤维增强塑料(CFRP)层压板的低速和高速冲击损伤。低速冲击试验是通过使用导向落锤系统进行的,而高速冲击试验是通过使用高速冲击试验机进行的。然后使用光学显微镜和软X射线照相术观察层压板中的损坏。从观察结果可以看出,微观损伤状态和损伤面积随冲击速度而变化。该变化归因于以下事实:低速冲击引起整体变形,而高速冲击能量主要被局部变形引起的破坏吸收。尽管增韧的中间层抑制了分层,从而降低了冲击能量,但较高的层间断裂韧性有时会导致层间分层过渡到层内分层。

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