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- Material Quality and Crack Initiation. 原料質(zhì)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(cháng)疲勞裂紋形成壽命，提高疲勞裂紋形成的抗力系數和裂紋形成的當量應力門(mén)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(cháng)疲勞裂紋形成壽命,提高疲勞裂紋形成的抗力系數和裂紋形成的當量應力門(mén)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(diǎn)和擴展途徑,并對四種材料熱疲勞抗力進(jìn)行了評價(jià)。
- Crack initiation and propagation process in A356 aluminium alloy under impact load have been investigated. 研究了A356鋁合金在沖擊載荷作用下的裂紋萌生及其擴展過(guò)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(huán)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(mén)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(jìn)裂紋萌生,同時(shí)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. 壽命預測采用多軸裂紋萌生疲勞分析，其中部件的多軸特性通過(guò)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(guān)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(guò)試驗證明了銹點(diǎn)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涂層質(zhì)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(yōu)質(zhì)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(jìn)行動(dòng)態(tài)拉伸原位觀(guān)察珠光體裂紋萌生與擴展的微觀(guān)過(guò)程。
- When opening, the hand wheel will give an initial resistance, then suddenly turnabout 1 /2 turn with little resistance. 開(kāi)啟的時(shí)候，手輪會(huì )引起一個(gè)最初的阻力，接著(zhù)在這個(gè)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(huì )導致在壓縮層過(guò)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于珠光體層片和拉伸軸的位向關(guān)系。
- 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，然后本周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%. 摘要采用U型缺口試樣研究了X60管線(xiàn)鋼經(jīng)5%25、10%25和15%25的預拉伸應變后的疲勞裂紋形成壽命。
