国产bbaaaaa片,成年美女黄网站色视频免费,成年黄大片,а天堂中文最新一区二区三区,成人精品视频一区二区三区尤物

首頁> 外文學(xué)位 >Two-parameter fracture mechanics analysis of mixed-mode specimens under static and fatigue loading.
【24h】

Two-parameter fracture mechanics analysis of mixed-mode specimens under static and fatigue loading.

機譯：靜態(tài)和疲勞載荷下混合模式試樣的兩參數(shù)斷裂力學(xué)分析。

獲取原文
獲取原文并翻譯 | 示例
  • 摘要
  • 著錄項
  • 相似文獻
  • 相關(guān)主題

摘要

The T-stress is a constant stress that acts parallel to the crack-front. In two-parameter fracture mechanics, the T-stress in conjunction with the stress intensity factor (SIF) is an important parameter for characterizing the stress state in the vicinity of a crack-tip. Due to its importance in characterizing the crack-tip stress field, T-stress values were calculated using finite element analysis (FEA) for a center cracked plate (CCP) and single-edge cracked plate (SECP) specimen. The T-stress values for both the CCP and SECP specimens were determined for cracks with relative sizes varying from 0.1 to 0.8 with respect to the specimen width and oriented at various angles between 0° and 90° with respect to the horizontal.;The crack-tip stress field is defined in terms of both the SIF and the T-stress using the William's series expansion [Williams, 1957]. The crack-tip stress field is incorporated into the Von Mises yield formula to develop an expression that models the crack-tip plastic zone under static mixed-mode loading conditions influenced by T-stress. Using the static plastic zone expression, the plastic zone is mapped and analyzed for various combinations of mode II to mode I SIF ratios and T-stress. The static plastic zone expression enables the characterization of constraint and fracture resistance under mixed-mode conditions.;The static plastic zone expression is adapted for cyclic loading conditions and used to develop a fatigue crack propagation model that takes into account the effect of both mixed-mode loading and T-stress. Finally, the cyclic plastic zone expression is used to demonstrate the significance of T-stress when predicting fatigue crack growth.
機譯：T應(yīng)力是平行于裂紋前沿的恒定應(yīng)力。在兩參數(shù)斷裂力學(xué)中，T應(yīng)力與應(yīng)力強度因子（SIF）一起是表征裂紋尖端附近應(yīng)力狀態(tài)的重要參數(shù)。由于其在表征裂紋尖端應(yīng)力場方面的重要性，因此使用有限元分析（FEA）計算了中心裂紋板（CCP）和單邊緣裂紋板（SECP）試樣的T應(yīng)力值。確定了CCP和SECP樣品的T應(yīng)力值，這些裂紋的相對尺寸相對于樣品寬度在0.1至0.8之間變化，并且相對于水平方向在0°至90°之間的不同角度定向。尖端應(yīng)力場是根據(jù)William的級數(shù)展開式根據(jù)SIF和T應(yīng)力定義的[Williams，1957]。將裂紋尖端應(yīng)力場合并到Von Mises屈服公式中，以開發(fā)一個表達式，該模型對受T應(yīng)力影響的靜態(tài)混合模式載荷條件下的裂紋尖端塑性區(qū)建模。使用靜態(tài)塑性區(qū)表達式，可對塑性區(qū)進行映射和分析，以獲取模式II與模式I SIF比率和T應(yīng)力的各種組合。靜態(tài)塑性區(qū)表達式可以表征混合模式條件下的約束和抗斷裂性能。靜態(tài)塑性區(qū)表達式適用于循環(huán)載荷條件，用于建立考慮了兩種混合效應(yīng)的疲勞裂紋擴展模型。模式加載和T應(yīng)力。最后，循環(huán)塑性區(qū)表達式用于證明預(yù)測疲勞裂紋擴展時T應(yīng)力的重要性。

著錄項

相似文獻

  • 外文文獻
  • 中文文獻
  • 專利
獲取原文

客服郵箱：kefu@zhangqiaokeyan.com

京公網(wǎng)安備：11010802029741號 ICP備案號：京ICP備15016152號-6 六維聯(lián)合信息科技 (北京) 有限公司?版權(quán)所有

  • 客服微信

  • 服務(wù)號