Abstract : in order to bring the material function into play the ramp load method demands the flange rigidification with great range and deep layer 文摘:坡道載荷設(shè)計(jì)法要求半軸法蘭圓角大直徑范圍和桿部深層硬化,以充分發(fā)揮材料的潛力,實(shí)現(xiàn)強(qiáng)度與塑性的合理配合。
Experimental and calculated results showed that creep proceeded in two phases and andrade theory could simulate appropriately the creep constitutive relations of pmma in single dimension . furthermore , the accumulation theory in low stress and the strain - rigidification theory in the first phase of creep could also describe approximately the constitutive relations of pmma 實(shí)驗(yàn)與計(jì)算結(jié)果表明,蠕變明顯地分為兩階段, andrade理論能很好地模擬pmma材料在恒定應(yīng)力作用下的一維蠕變型本構(gòu)關(guān)系;陳化理論在低應(yīng)力水平下及應(yīng)變硬化理論在蠕變第一階段也可近似地描述pmma的本構(gòu)關(guān)系。
Basing on experiments , the creep constitutive relations of pmma were researched . creep experiments of single dimension were done on three specimens with no defects under constant stress and the andrade theory , the accumulation theory , the strain - rigidification theory , the norton theory were applied to fit the experimental data 做了三組恒定應(yīng)力條件下的無(wú)缺陷pmma試件的蠕變實(shí)驗(yàn),分別用andrade理論、陳化理論、應(yīng)變硬化理論及恒速理論對(duì)實(shí)驗(yàn)數(shù)據(jù)進(jìn)行了擬合。