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- Material Quality and Crack Initiation. 原料質量、及初始裂紋的壽命。
- The pre-straining prolonged the fatigue crack initiation life, and increased resistance coefficient and equivalent stress threshold of the fatigue crack initiation. 預應變可以延長疲勞裂紋形成壽命,提高疲勞裂紋形成的抗力係數和裂紋形成的當量應力門檻值;
- The pre-straining prolonged the fatigue crack initiation life,and increased resistance coefficient and equivalent stress threshold of the fatigue crack initiation. 預應變可以延長疲勞裂紋形成壽命,提高疲勞裂紋形成的抗力係數和裂紋形成的當量應力門檻值;
- The fractography of the fatigue crack initiation displayed cleavage f... 裂紋形成的斷裂為穿晶解理機制,預應變可導致更多的二次裂紋。
- Thermal fatigue crack initiation and propagation paths of the high-chromi-um, middle Ni-Cr, adamite(165CrNiM.) and 9Cr2 (the forged steel) rollmaterials have been investigated. Thermal fatigue resistance of the four mater-ials has been evaluated. 本文研究高Cr鑄鐵、中Ni-Cr激冷鑄鐵、半鋼(165CrNiMo)及鍛鋼(9Cr2)四種熱軋輥材料的熱裂紋萌生特點和擴展途徑,並對四種材料熱疲勞抗力進行了評價。
- Crack initiation and propagation process in A356 aluminium alloy under impact load have been investigated. 研究了A356鋁合金在衝擊載荷作用下的裂紋萌生及其擴展過程。
- For the notched specimens, there are multiple crack initiation sites on the fractography. 瞬斷區所承受的斷裂應力隨循環應力升高而降低;
- The evaluation of crack initiation life is directly affected bythe reliability of nondestructive testing. 檢測方法的可靠性直接影響結構疲勞裂紋形成壽命估計值。
- The threshold of the fatigue crack initiation from the notch of the microbeam is close to that of the bulk material. 疲勞裂紋從尖缺口處萌生的門檻值接近塊體材料。
- The addition of AlO_2 tended to shorten the period of time for crack initiation, whereas to retard crack propagation. 對鋼的應力腐蝕存在雙重影響,即促進裂紋萌生,同時又對裂紋擴展起抑制作用。
- Biaxial analysis was used to get the multiaxial information, and fatigue calculation of multiaxial crack initiation was conducted. 壽命預測採用多軸裂紋萌生疲勞分析,其中部件的多軸特性通過二軸分析獲得。
- Fractography analyses with scanning electron microscopy (SEM) were conducted to investigate the corrosion fatigue crack initiation mechanism. 此外,亦利用掃描式電子顯微鏡(SEM)觀察破斷面,以了解疲勞破壞機制。
- Experiments demonstrate that leaf spring crack results from rust spot as fatigue crack initiation,and in order to improve spring life it must be to improve coating quality. 通過試驗證明了銹點是導致鋼板彈簧斷裂的新的疲勞源,為提高彈簧的使用壽命必須提高其塗層質量。
- Even the best stocks, which initially resist the downtrend, succumb to the persistence of the Bear. 即使前期比較抗跌的優質股票,最終也在持續的熊市中屈服了。
- The microprocess of crack initiation and propagation in pearlite under fensile loading has been investigated by in situ observation using a transmission electron microscope. 在透射電鏡中進行動態拉伸原位觀察珠光體裂紋萌生與擴展的微觀過程。
- When opening, the hand wheel will give an initial resistance, then suddenly turnabout 1 /2 turn with little resistance. 開啟的時候,手輪會引起一個最初的阻力,接著在這個小阻力下突然旋轉大約1/2圈。
- Discontinuous shot-peening can lead to crack initiation at the tensile surface stresses adjacent to edges of abrupt compressive layer runouts (no fadeout). 受表面張力作用,不連續噴丸會導致在壓縮層過渡段突變的邊沿出現裂紋。
- The results indicate that the crack initiation and propagation mechanism depends on the orientation of pearlite lamellae with respect to the tensile axis. 結果表明:珠光體裂紋萌生與擴展方式取決於珠光體層片和拉伸軸的位向關係。
- Initial resistance is at 75.40 then Bollinger Band resistance above is at 78.65 this week (WTI) but we have our sights set on 80 and higher. 初始阻力位在75.;40,然後本周WTI保寧阻力位在78
- The U-notch specimens were used to investigate the fatigue crack initiation life of X60 pipeline steel after pre-tension straining with ductile deformation of 5%, 10% and 15%. 摘要採用U型缺口試樣研究了X60管線鋼經5%25、10%25和15%25的預拉伸應變后的疲勞裂紋形成壽命。