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Hastelloy C-276合金應(yīng)力松弛試驗(yàn)及蠕變本構(gòu)方程
發(fā)布人：上海艾荔艾金屬材料有限公司www.jshcn.cn
更新時(shí)間：2015-10-12
對(duì)Hastelloy C-276合金分別在不同的溫度(750、800、850和900 ℃)和相應(yīng)的初始應(yīng)力(250、250、250和200 MPa)條件下進(jìn)行了多組應(yīng)力松弛試驗(yàn)。
Hastelloy C-276合金應(yīng)力松弛試驗(yàn)及蠕變本構(gòu)方程Stress relaxation test of Hastelloy C-276 alloy and?its creep constitutive equation
對(duì)Hastelloy C-276合金分別在不同的溫度(750、800、850和900 ℃)和相應(yīng)的初始應(yīng)力(250、250、250和200 MPa)條件下進(jìn)行了多組應(yīng)力松弛試驗(yàn)。利用試驗(yàn)測(cè)得的應(yīng)力松弛曲線(xiàn)推導(dǎo)出應(yīng)力松弛過(guò)程中蠕變應(yīng)變速率與應(yīng)力之間的關(guān)系，建立用于描述Hastelloy C-276合金應(yīng)力松弛行為的蠕變本構(gòu)方程，通過(guò)對(duì)蠕變應(yīng)變速率-應(yīng)力曲線(xiàn)進(jìn)行擬合，得到各溫度下蠕變本構(gòu)方程中的材料常數(shù)。將蠕變本構(gòu)方程帶入有限元軟件MSC.Marc對(duì)Hastelloy C-276合金的應(yīng)力松弛過(guò)程進(jìn)行模擬，模擬得到的應(yīng)力松弛曲線(xiàn)與試驗(yàn)測(cè)得的應(yīng)力松弛曲線(xiàn)符合得很好，驗(yàn)證蠕變本構(gòu)方程的可靠性。
The stress relaxation tests of Hastelloy C-276 alloy were conducted at different temperatures (750, 800, 850 and 900 ℃) and corresponding initial stress levels (250, 250, 250 and 200 MPa), respectively. Based on the experimental stress relaxation curves, the relationship between creep strain rate and stress was derived. Then, a set of creep constitutive equations were built for Hastelloy C-276 alloy and the material constants of these equations were determined by fitting the creep strain rate-stress curves. The creep constitutive equations were used to simulate the stress relaxation process of Hastelloy C-276 alloy by integrating these equations into finite element software MSC.Marc. The simulated stress relaxation curves agree well with the experimental ones, which verify the reliability of the creep constitutive equations.
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