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Ti40阻燃鈦合金熱變形的開裂預(yù)測(cè)
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TG146.23

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Fracture Predicting of Ti40 Burn Resistant Titanium Alloy in Hot Forming
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    摘要:

    Ti40阻燃鈦合金熱變形困難且容易發(fā)生開裂。因此,研究該合金在不失效的情況下實(shí)現(xiàn)預(yù)期的變形就顯得非常重要。本研究采用韌性斷裂準(zhǔn)則和有限元模擬相結(jié)合的方法,對(duì)Ti40合金熱變形過程進(jìn)行開裂預(yù)測(cè)。通過圓柱試樣不同溫度和應(yīng)變速率的壓縮模擬試驗(yàn),發(fā)現(xiàn)在一定的變形條件下該合金會(huì)發(fā)生縱向開裂和剪切開裂。隨后的有限元模擬獲得了變形試樣各個(gè)區(qū)間的應(yīng)力一應(yīng)變分布情況及演變過程,這被用來評(píng)價(jià)6種已有的韌性斷裂準(zhǔn)則對(duì)Ti40合金高溫變形的初始開裂位置及損傷值預(yù)測(cè)的準(zhǔn)確性。研究結(jié)果表明,只有Oyane韌性斷裂準(zhǔn)則能準(zhǔn)確地預(yù)測(cè)試驗(yàn)范圍內(nèi)所有條件的Ti40合金的初始開裂位置和臨界開裂值。

    Abstract:

    Ti40 burn resistant titanium alloy shows excellent burn-resistance performance and good mechanical properties at room temperature. However, it is easy to crack because of low ductility at high temperature, especially during the ingot cogging procedure. An important concern in forming is whether or not the desired deformation can be accomplished without failure of this alloy. This paper described the utilization of ductile fracture criteria in conjunction with the finite element method for predicting failures in hot forming processes of Ti40 alloy. Cylindrical specimens under compression tests at different deformed temperatures and strain rates were experimentally investigated. It is found that the alloy exhibited longitudinal cracking and shear cracking at some conditions of deformation. Subsequently, the finite element numerical simulation of the tests obtained local stress-strain history, which was used to evaluate six previously published ductile fracture criteria for predicting the accuracies of the fracture initiation locations of Ti40 alloy in hot forming. It is proved that only Oyane et al. ductile fracture criteria can accurately predict the initial location of fracture and the damage of Ti40 alloy for all the tests performed in this work.

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舒瀅 曾衛(wèi)東 張學(xué)敏 趙永慶 周義剛 周廉. Ti40阻燃鈦合金熱變形的開裂預(yù)測(cè)[J].稀有金屬材料與工程,2006,35(12):1900~1903.[Shu Ying, Zeng Weidong, Zhang Xuemin, Zhao Yongqing, Zhou Yigangl, Zhou Lian. Fracture Predicting of Ti40 Burn Resistant Titanium Alloy in Hot Forming[J]. Rare Metal Materials and Engineering,2006,35(12):1900~1903.]
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  • 收稿日期:2006-09-19
  • 最后修改日期:2006-09-19
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