本文選題：復(fù)雜應(yīng)力狀態(tài) + 全載荷過(guò)程�。� 參考：《應(yīng)用基礎(chǔ)與工程科學(xué)學(xué)報(bào)》2017年02期

【摘要】：針對(duì)材料在復(fù)雜應(yīng)力狀態(tài)下全載荷過(guò)程中的力學(xué)行為問(wèn)題,應(yīng)用實(shí)心圓軸試件進(jìn)行拉扭聯(lián)合試驗(yàn),重點(diǎn)解決試驗(yàn)中拉伸扭轉(zhuǎn)應(yīng)力時(shí)時(shí)按固定比例C(σ/τ)加載的難題.以304不銹鋼和16Mn R碳鋼為研究對(duì)象,進(jìn)行24組不同C值的拉扭試驗(yàn).在此基礎(chǔ)上,研究了實(shí)心圓軸試件在全壽命過(guò)程中等效真應(yīng)力應(yīng)變的處理方法,探索了不同應(yīng)力狀態(tài)對(duì)塑性極限承載能力的影響,并引入三軸應(yīng)力度(TS)概念對(duì)其進(jìn)行表征.結(jié)果表明:兩種材料的極限應(yīng)力(σ_(max))隨著不同TS值變化均存在應(yīng)力駐點(diǎn),此處材料的σ_(max)最小;兩種材料的極限應(yīng)變(ε_(tái)(max))與TS值呈現(xiàn)反比函數(shù)關(guān)系;利用本文所提出的工程計(jì)算公式,可以在確定結(jié)構(gòu)某點(diǎn)的應(yīng)力狀態(tài)情況下,推測(cè)結(jié)構(gòu)在此時(shí)所能承受的極限應(yīng)力與極限應(yīng)變.但是不同材料的σ_(max)-TS、ε_(tái)(max)-TS呈現(xiàn)不同的函數(shù)關(guān)系,需分別進(jìn)行試驗(yàn)標(biāo)定.
[Abstract]:In order to solve the problem of mechanical behavior of materials under full load under complex stress state, the combined tensile and torsional tests are carried out by using solid circular axial specimens, and the problem that tensile torsional stress is always loaded at a fixed ratio C (蟽 / 蟿) in the test is solved. The tensile and torsion tests of 304 stainless steel and 16MnR carbon steel were carried out in 24 groups with different C values. On this basis, the treatment method of equivalent true stress and strain in the whole life of solid circular axial specimen is studied, and the influence of different stress states on plastic ultimate bearing capacity is explored, and the concept of triaxial force is introduced to characterize it. The results show that the limit stress of the two kinds of materials has the minimum stress stop point with different TS values, and the limit strain of the two materials is inversely proportional to the TS value, and the engineering calculation formula presented in this paper shows that the limit strain of the two materials is inversely proportional to the TS value, and that the limit strain of the two materials is inversely proportional to the TS value. Under the condition of determining the stress state of the structure at a certain point, the limit stress and the ultimate strain of the structure can be inferred at this time. However, 蟽 _ S _ max _ T _ S and 蔚 _ T _ (max-TS) of different materials show different functional relationships, and need to be calibrated separately.
【作者單位】： 北京工業(yè)大學(xué)機(jī)械工程與應(yīng)用電子技術(shù)學(xué)院;
【基金】：國(guó)家重點(diǎn)研發(fā)計(jì)劃(2016YFC0801905-16)
【分類號(hào)】：TB301

【相似文獻(xiàn)】

相關(guān)期刊論文 前2條

1 王翔;王波;矯桂瓊;常巖軍;;平紋編織C/SiC材料復(fù)雜應(yīng)力狀態(tài)的力學(xué)行為試驗(yàn)研究[J];機(jī)械強(qiáng)度;2010年01期

2 ;[J];;年期

相關(guān)會(huì)議論文 前1條

1 王翔;王波;矯桂瓊;;平紋編織C/SiC壓剪復(fù)雜應(yīng)力狀態(tài)試驗(yàn)研究[A];第十五屆全國(guó)復(fù)合材料學(xué)術(shù)會(huì)議論文集（下冊(cè)）[C];2008年

，

本文編號(hào)：2020086