發(fā)布時間：2018-10-24 17:41

【摘要】：自行研制的摩擦磨損裝置與軸向疲勞試驗機相互配合,實現(xiàn)GDL-1鋼試樣在疲勞應(yīng)力(240~280 MPa)及接觸載荷(30 N)作用下摩擦磨損疲勞試驗.通過對磨損層厚度的分析,研究試樣承受摩擦磨損載荷及拉壓疲勞載荷雙重作用下的疲勞壽命變化,用SEM掃描電鏡觀察分析次表層內(nèi)疲勞裂紋擴展的演變過程,并采用Hertz線彈性理論和Smith接觸理論計算分析摩擦表面以下切應(yīng)力值.結(jié)果表明:在磨損疲勞載荷作用下,形變層的流變作用將顯著影響疲勞小裂紋擴展方向,漸趨于切應(yīng)力方向,從而提高試樣疲勞壽命.在此基礎(chǔ)上,建立了在摩擦磨損疲勞載荷下疲勞裂紋擴展模型.此外,計算可知在距表層深度0.03 mm處切應(yīng)力最大,0.18 mm以內(nèi)材料產(chǎn)生塑性變形,導致形變層的形成.
[Abstract]:The friction and wear device developed by ourselves and the axial fatigue testing machine cooperate to realize the friction and wear fatigue test of GDL-1 steel specimen under the action of fatigue stress (240 ~ 280 MPa) and contact load (30 N). Based on the analysis of the thickness of the wear layer, the fatigue life of the specimen subjected to both friction and wear loads and tensile and compressive fatigue loads is studied. The evolution process of fatigue crack propagation in the subsurface layer is observed by SEM scanning electron microscope. Hertz linear elastic theory and Smith contact theory are used to calculate and analyze the shear stress below friction surface. The results show that under the action of wear fatigue load, the rheological effect of the deformed layer will significantly affect the direction of fatigue crack propagation and gradually tend to the direction of shear stress, thus improving the fatigue life of the specimen. On this basis, the fatigue crack growth model under friction and wear fatigue load is established. In addition, the maximum shear stress is found at the depth of 0.03 mm from the surface layer, and the plastic deformation occurs within 0.18 mm, resulting in the formation of the deformation layer.
【作者單位】： 貴州大學材料科學與冶金工程學院;貴州省材料結(jié)構(gòu)與強度重點實驗室;
【基金】：科技部科技創(chuàng)新項目(04C26215200858)資助~~
【分類號】：TG115.5

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相關(guān)期刊論文 前2條

1 梁益龍;汪航;譚起兵;李光新;劉海鸝;;GDL-1鋼表面摩擦磨損及其干擾層對疲勞壽命的影響[J];鋼鐵;2008年11期

2 梁益龍,雷e，

本文編號：2292085