本文關(guān)鍵詞：透明聚碳酸酯材料疲勞斷裂行為　出處：《材料工程》2017年11期 　論文類型：期刊論文

  更多相關(guān)文章： 聚碳酸酯 疲勞斷裂 應(yīng)力比 退火 斷口形貌

【摘要】：研究不同應(yīng)力比(R)以及退火處理對透明聚碳酸酯(PC)板材疲勞性能的影響規(guī)律與機(jī)理,并對聚碳酸酯疲勞裂紋擴(kuò)展過程與機(jī)理進(jìn)行分析。結(jié)果表明:退火后聚碳酸酯試樣的殘余應(yīng)力明顯變小,疲勞性能明顯提高,這是由于機(jī)加工造成PC試樣殘余拉應(yīng)力,而消除殘余拉應(yīng)力能夠明顯改善PC的疲勞性能;正應(yīng)力比(拉拉疲勞)情況下,隨著應(yīng)力幅值變大,PC的疲勞性能明顯下降,而負(fù)應(yīng)力比(拉壓疲勞)對PC的疲勞性能影響較為復(fù)雜。斷口形貌分析表明,PC疲勞裂紋斷口存在明顯的裂紋源區(qū)、穩(wěn)定擴(kuò)展區(qū)與失穩(wěn)區(qū),而PC的疲勞裂紋擴(kuò)展機(jī)理是首先在應(yīng)力作用下產(chǎn)生銀紋,當(dāng)應(yīng)力超過銀紋中微纖維強(qiáng)度或在多次循環(huán)應(yīng)力作用下疲勞而造成微纖維破壞時,銀紋便發(fā)展為裂紋。
[Abstract]:The effects of different stress ratios (R) and annealing treatment on fatigue properties of transparent polycarbonate (PC) sheets were studied. The process and mechanism of fatigue crack growth of polycarbonate were analyzed. The results showed that the residual stress of the sample was obviously smaller and the fatigue property was improved obviously after annealing. This is due to the residual tensile stress of PC specimen caused by machining, but eliminating residual tensile stress can obviously improve the fatigue performance of PC. In the case of normal stress ratio (Lara fatigue), the fatigue performance of PC decreases obviously with the increase of stress amplitude, but the influence of negative stress ratio (tensile / compressive fatigue) on the fatigue performance of PC is more complex. The fracture morphology analysis shows that the fatigue performance of PC decreases with the increase of stress amplitude. There are obvious crack source region, stable growth zone and unstable zone on the fracture surface of PC fatigue crack, and the fatigue crack growth mechanism of PC is to produce craze at first under the action of stress. When the stress exceeds the strength of the microfiber in the craze or fatigue caused by repeated cyclic stress, the craze will develop into a crack.
【作者單位】： 中國航發(fā)北京航空材料研究院;
【基金】：益材基金(YF53130808)
【分類號】：TB324
【正文快照】： ZHANG Xiao-wen,WU Nan,ZHANG Xuan,MA Li-ting,LI Lei(AECC Beijing Institute of Aeronautical Materials,Beijing 100095,China)聚碳酸酯(PC)具有很好的光學(xué)性能(2mm厚板材的透光率可達(dá)90%以上),較高的彈性模量,突出的耐沖擊性能,沖擊強(qiáng)度比聚酰胺、聚甲醛等高出3~10倍,另

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