【摘要】：采用瑞利波評價激光熔覆層表面應(yīng)力,結(jié)合靜載拉伸試驗(yàn),建立Fe314激光熔覆層中瑞利波的聲彈關(guān)系曲線;通過對聲彈關(guān)系曲線擬合實(shí)現(xiàn)對激光熔覆材料聲彈系數(shù)的標(biāo)定,在此基礎(chǔ)上建立聲彈公式;通過試驗(yàn)驗(yàn)證聲彈公式評價激光熔覆層表面應(yīng)力的可行性。分析激光熔覆層微觀組織及殘余應(yīng)力對應(yīng)力評價結(jié)果的影響,試驗(yàn)結(jié)果表明,這兩種因素會顯著影響熔覆層表面應(yīng)力評價結(jié)果,采用聲彈公式計(jì)算出的初始應(yīng)力校準(zhǔn)之后,理論計(jì)算結(jié)果與實(shí)際加載值更為接近,并且誤差保持在可接受的范圍之內(nèi)。此外,由于靜載拉伸過程中各向異性激光熔覆層變形不均勻,瑞利波檢測應(yīng)力試驗(yàn)中高應(yīng)力階段的誤差明顯大于低應(yīng)力階段誤差。
[Abstract]:In this paper, Rayleigh wave is used to evaluate the surface stress of the laser cladding layer, and the acoustic-elastic relationship curve of the Rayleigh wave in the Fe314 laser cladding layer is established by combining the static load tensile test. The feasibility of the surface stress of the laser cladding layer is evaluated by means of the experimental verification of the acoustic-elastic formula. The effect of the microstructure and residual stress of the laser cladding on the results of the stress evaluation is analyzed. The results show that the two factors can significantly influence the results of the stress evaluation on the surface of the cladding, and after the initial stress calibration calculated by the acoustic-elastic formula, The theoretical calculation result is closer to the actual load value and the error remains within the acceptable range. in addition, that error of the high stress stage in the Rayleigh wave detection stress test is obviously lar than that of the low stress stage due to the non-uniform deformation of the anisotropic laser cladding layer during the static load drawing process.
【作者單位】： 裝甲兵工程學(xué)院裝備再制造技術(shù)國防科技重點(diǎn)實(shí)驗(yàn)室;北京理工大學(xué)機(jī)械與車輛學(xué)院;
【基金】：國家重點(diǎn)基礎(chǔ)研究發(fā)展計(jì)劃(973計(jì)劃,2011CB013403) 國家自然科學(xué)基金(50975287)資助項(xiàng)目
【分類號】：TG174.4;TG115

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1 魏勤;衛(wèi)婷;宋廣三;;超聲瑞利波測試材料表面載荷應(yīng)力的實(shí)驗(yàn)研究[J];實(shí)驗(yàn)力學(xué);2011年02期

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