- 極限應(yīng)力
- 臨界應(yīng)力
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limiting stress中文什么意思
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- This paper overviewed the prediction methods of forming limit in sheet metal forming , which included forming limit stress diagram , the maximum forming thinning ratio , forming limit diagram and ductile fracture criteria ( dfc )
摘要對(duì)板料成形中的成形極限應(yīng)力圖、最大變薄率、成形極限圖以及韌性斷裂準(zhǔn)則等預(yù)測(cè)成形極限的方法，進(jìn)行了綜述和分析。 - According to the former mathematical calculation models , the applied software , which uses the forming limit stress diagram as its instability criterion , is developed based on the sheet metal forming finite element code dynaform using visual c + +
根據(jù)以上所建立的數(shù)學(xué)計(jì)算模型,基于板成形專用有限元分析軟件dynaform的環(huán)境,用visualc + +開(kāi)發(fā)了以成形極限應(yīng)力圖作為判據(jù)的應(yīng)用軟件。 - 3 . the crane load and fatigue strength are regarded as stochastic process , the fatigue dynamic reliability based on limit stress model and fatigue dynamic reliability based on accumulation damage model are established on the base of statistic analysis the fatigue load and resistance
3 、在對(duì)疲勞荷載與抗力統(tǒng)計(jì)分析的基礎(chǔ)上，視吊車荷載與疲勞強(qiáng)度為隨機(jī)過(guò)程，建立了基于極限應(yīng)力模式的疲勞動(dòng)態(tài)可靠性分析模型及基于累積損傷模型的疲勞動(dòng)態(tài)可靠性分析模型。 - In view of the above reason , this thesis adopts the forming limit stress diagram as the instability criterion due to its independence of strain paths , which is acknowledged at home and abroad in the field of sheet metal forming , and develops the applied software for the special purpose finite element analysis code dynaform in order to provide it with a new instability criterion
本文基于板成形專用有限元分析軟件dynaform ,以國(guó)內(nèi)外板料成形領(lǐng)域認(rèn)同的具有應(yīng)變路徑獨(dú)立性優(yōu)點(diǎn)的成形極限應(yīng)力圖為判據(jù)進(jìn)行了應(yīng)用軟件的二次開(kāi)發(fā),以期為板成形有限元分析軟件提供一個(gè)新的失穩(wěn)判據(jù)。 - This thesis briefly analyzes some yield criteria and instability criteria to the sheet metal forming first . then according to the transformation rule from ultimate strain to ultimate stress , it establishes the mathematical calculation models of the forming limit stress diagram for the software development according to hill48 、 hill79 and hosford yield criterion irrespectively
本文首先分析了板料成形的屈服準(zhǔn)則和失穩(wěn)準(zhǔn)則,然后根據(jù)極限應(yīng)變到極限應(yīng)力的轉(zhuǎn)換關(guān)系,分別采用hill48屈服準(zhǔn)則、 hill79屈服準(zhǔn)則和hosford屈服準(zhǔn)則,建立了用于軟件開(kāi)發(fā)的成形極限應(yīng)力圖的數(shù)學(xué)計(jì)算模型。