(1)碳纖維在持續(xù)的應(yīng)力作用下,會(huì)產(chǎn)生隨時(shí)間的延長(zhǎng)而增加的變形,即蠕變。當(dāng)把碳纖維張拉到設(shè)計(jì)的應(yīng)力值后,維持長(zhǎng)度固定不變,碳纖維的應(yīng)力會(huì)隨時(shí)間的延續(xù)而逐漸降低,這種應(yīng)力的降低即形成了預(yù)應(yīng)力損失 (2)黏結(jié)材料的長(zhǎng)期變形黏結(jié)樹(shù)脂在固化時(shí)會(huì)伴隨有體積收縮的現(xiàn)象,也將造成預(yù)···