脆性裂紋擴展 的英文怎麼說
中文拼音 [cuìxìnglièwénkuòzhǎn]
脆性裂紋擴展
英文
brittle crack propagation-
Subcritical crack growth and influence of biaxial stress in brittle materials
脆性材料的亞臨界裂紋擴展和雙向應力的影響: 36 < kth < 37 mpa / m3 / 2, 42 < kih < 44mpa / m3 / 2, 51 < kc < 52 mpa / m3 / 2 through the sem fractography, it is know that the susceptibility to brittle failure at room temperature is more than below 100 ?. and the susceptibility to brittle failure increase with hydrogen increasing, under the sustained loading, ductile cracking appears. the quantity of brittle cracking is more with crack growth
T44mpa m 『 q ， sl lt52mpa in 』 」斷口分析表明，該合金充氫后其室溫時的氫脆敏感性大於100oc時的氫脆敏感性；且隨氫含量升高，氫脆敏感性增加：在恆載荷的作用下，該合金裂二紋開始擴展時顯示的是韌性起裂；隨裂紋增長，試樣脆性斷裂的比例增大。But when heavyly loaded, the former is far better than the latter. the wear resistance of za27 alloyed with mn is no obviously better than that of common za27 alloy. under the sliding friction conditions, the wear resistance at high temperature of za27 is improved by alloyed si and reaches the highest level when the content of si is 1 - 3wt. %
裂紋主要始於脆性相si相和mn相，裂紋沿晶界擴展；在滑動摩擦條件下（常溫） ，含si的za27合金在載重較小時，耐磨性與普通za合金相比沒有明顯提高，但在載荷較大的情況下，其耐磨性遠高於普通za27合金材料；加mn的za27合金與常規za27合金相比，耐磨性沒有明顯提高；在滑動摩擦條件下， si的加入提高了za27合金的高溫摩擦性能。Except for a small length of web at the first fracture location, none of the cracks exhibited a brittle fracture mode of crack propagation.
除第一個斷裂位置的一小段腹板外，沒有一條裂紋顯示出裂紋擴展的脆性斷裂模式。The cracks extend along the matrix / strengthening - phases interfaces and form the cleavage steps and tear ridges. there appear some very small dimples on the fracture surfaces of the directionally solidified samples, which come from the nb - based solid solution particles in the big plates of the strengthening phases, but no dimples on the fracture surfaces of the as - cast sample. it can be concluded from above results that niobium - niobium silicide based in - situ composites ( rmics ) with a uniformly orientated microstructure can be produced by the ebfzm with high temperature gradient, and their mechanical properties can be increased
隨著抽拉速率的提高和硅化鈮強化相間距與尺度的減小，材料的室溫拉伸強度和斷裂韌性均有提高， _ b最高可達778 . 4mpa ， k _ （ ic ）達到了46 . 3mpa ? m ~ （ 1 / 2 ） ；試樣的拉伸斷口基本表現為脆性解理斷裂的花樣，裂紋沿基體強化相界面繞過強化相進行擴展，在裂紋擴展方向存在解理臺階，並形成撕裂棱。In the present thesis, researches on the micro - mechanisms and the macro - mechanical models of fcp in high ductility -, low ductility - and brittle materials, including metals, ceramics and polymers, are briefly summarized. furthermore, systematic investigation is made on the general fcp pattern, the fcp micro - mechanisms, the mechanical models and the intrinsic - and extrinsic factors affecting fcp by using the approach combining the analysis and the experiments. finally, an almost perfect formula for fcp is developed
本文系統地分析和總結了中外文獻對高塑性材料、低塑性材料和脆性材料，包括金屬材料、高分子材料和陶瓷材料的疲勞裂紋擴展微觀機制和宏觀力學模型的研究結果，進而採用理論分析與實驗研究相結合的方法，從微觀和宏觀兩個方面對疲勞裂紋擴展的一般規律、影響因素、微觀機制、力學條件和宏觀規律及其定量理論進行了深入的研究，給出了為實驗結果所驗證的接近完善的疲勞裂紋擴展表達式。分享友人