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1、13ABAQUS/Explicit準(zhǔn)靜態(tài)分析顯式求解方法是一種真正的動(dòng)態(tài)求解過(guò)程,它的最初發(fā)展是為了模擬高速?zèng)_擊問(wèn)題,在這類問(wèn)題的求解中慣性發(fā)揮了主導(dǎo)性作用。當(dāng)求解動(dòng)力平衡的狀態(tài)時(shí),非平衡力以應(yīng)力波的形式在相鄰的單元之間傳播。由于最小穩(wěn)定時(shí)間增量一般地是非常小的值,所以大多少問(wèn)題需要大量的時(shí)間增量步。在求解準(zhǔn)靜態(tài)問(wèn)題上,顯式求解方法已經(jīng)證明是有價(jià)值的,另外ABAQUS/Explicit在求解某些類型的靜態(tài)問(wèn)題方面比ABAQUS/Standard更容易。在求解復(fù)雜的接觸問(wèn)題時(shí),顯式過(guò)程相對(duì)于隱式過(guò)程的一個(gè)優(yōu)勢(shì)是更加容易。此
2、外,當(dāng)模型成為很大時(shí),顯式過(guò)程比隱式過(guò)程需要較少的系統(tǒng)資源。關(guān)于隱式與顯式過(guò)程的詳細(xì)比較請(qǐng)參見(jiàn)第2.4節(jié)“隱式和顯式過(guò)程的比較”。將顯式動(dòng)態(tài)過(guò)程應(yīng)用于準(zhǔn)靜態(tài)問(wèn)題需要一些特殊的考慮。根據(jù)定義,由于一個(gè)靜態(tài)求解是一個(gè)長(zhǎng)時(shí)間的求解過(guò)程,所以在其固有的時(shí)間尺度上分析模擬常常在計(jì)算上是不切合實(shí)際的,它將需要大量的小的時(shí)間增量。因此,為了獲得較經(jīng)濟(jì)的解答,必須采取一些方式來(lái)加速問(wèn)題的模擬。但是帶來(lái)的問(wèn)題是隨著問(wèn)題的加速,靜態(tài)平衡的狀態(tài)卷入了動(dòng)態(tài)平衡的狀態(tài),在這里慣性力成為更加起主導(dǎo)作用的力。目標(biāo)是在保持慣性力的影響不顯著的前提下用最
3、短的時(shí)間進(jìn)行模擬。準(zhǔn)靜態(tài)(Quasi-static)分析也可以在ABAQUS/Standard中進(jìn)行。當(dāng)慣性力可以忽略時(shí),在ABAQUS/Standard中的準(zhǔn)靜態(tài)應(yīng)力分析用來(lái)模擬含時(shí)間相關(guān)材料響應(yīng)(蠕變、膨脹、粘彈性和雙層粘塑性)的線性或非線性問(wèn)題。關(guān)于在ABAQUS/Standard中準(zhǔn)靜態(tài)分析的更多信息,請(qǐng)參閱ABAQUS分析用戶手冊(cè)(ABAQUSAnalysisUser’sManual)的第6.2.5節(jié)“Quasi-staticanalysis”。13.1顯式動(dòng)態(tài)問(wèn)題類比為了使你能夠更直觀地理解在緩慢、準(zhǔn)靜態(tài)加載
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