本文關(guān)鍵詞：基于M-C屈服準則的金屬玻璃切削力學建模與實驗研究　出處：《燕山大學》2015年碩士論文　論文類型：學位論文

  更多相關(guān)文章： 金屬玻璃 屈服準則 正交切削模型 切削力 切削溫度

【摘要】：材料的微觀結(jié)構(gòu)決定其宏觀性質(zhì)。金屬玻璃(非晶態(tài)合金)因具有短程有序、長程無序的原子組態(tài)而具有諸多優(yōu)良的物理、力學特征,進而在航空航天,IT存儲器等領(lǐng)域具有廣泛的潛在應(yīng)用前景。切削加工是材料零件成型加工的重要方法之一,而在切削機理的研究中切削力學特性是其重要組成部分。針對金屬玻璃在材料力學試驗中表現(xiàn)出的拉-壓非對稱性,并考慮該類材料的壓力及溫度敏感性,認為已有的適用于描述晶態(tài)材料屈服過程的Tresca、Mises等屈服準則不能很好地描述金屬玻璃的切削形變屈服過程。本文嘗試將M-C屈服準則引入金屬玻璃切削力學特性的理論研究中來,同時考慮切削溫度的影響建立其切削力解析模型,并進行實驗驗證,實驗結(jié)果較好的證實了理論建模工作的有效性。具體研究內(nèi)容如下:基于巖土結(jié)構(gòu)與金屬玻璃原子團簇結(jié)構(gòu)的相似性,將適用于巖土力學領(lǐng)域的M-C屈服準則引入到金屬玻璃切削加工的形變屈服中來�？紤]金屬玻璃剪切形變時對壓力和溫度的敏感特性,對M-C屈服準則加以改進后建立了適用于描述金屬玻璃的正交切削力學解析模型。為了求解上述解析模型,在車削實驗之后測量切屑厚度與寬度,利用最小做功原理得到了解析模型中的剪切角以及刀-屑摩擦角。采用熱力學分析法將剪切面上的做功轉(zhuǎn)化為切削溫升后給出了切削模型中剪切面上的平均溫度計算公式。利用切削力實測數(shù)據(jù)對上述模型進行了對比驗證。實驗結(jié)果表明,在同樣的切削用量下,適用于傳統(tǒng)晶態(tài)金屬的切削力模型、未考慮切削溫升的M-C準則切削力模型,以及考慮切削溫升影響的M-C準則切削力模型三者當中,后者的計算精度最高。切削力模型的理論計算值與實測值之間的最大誤差為14.8%,平均誤差在8.9%�；赥resca或Mises準則的傳統(tǒng)解析模型與切削力實測結(jié)果的誤差在59%以上,實驗結(jié)果充分的證明了理論建模工作的有效性。
[Abstract]:The microstructure of a material determines its macroscopic properties. Metallic glass (amorphous alloy) has many excellent physical and mechanical characteristics due to its short range and long range disorder, and has potential applications in aerospace, IT memory and other fields. Cutting is one of the most important methods for the forming of material parts. In the study of the mechanism of cutting, the characteristics of cutting mechanics are the important part of the cutting mechanism. To show the metallic glass in material mechanics test of tension compression asymmetry, and considering the pressure and temperature sensitivity of the material, think of the existing crystalline material is applied to describe the process of Tresca and Mises yield criterion can well describe the cutting deformation of metallic glasses yield process. This paper attempts to introduce the M-C yield criterion into the theoretical research of metal glass cutting mechanical properties. At the same time, considering the influence of cutting temperature, the analytical model of cutting force is established, and the experimental verification is carried out. The experimental results confirm the validity of the theoretical modeling work. The specific research contents are as follows: Based on the similarity between geotechnical structure and metallic glass cluster structure, the M-C yield criterion applicable to geotechnical field is introduced into the deformation yield of metal glass cutting. Considering the sensitive characteristics of metal glass to pressure and temperature when shearing deformation is taken into account, an analytical model for orthogonal cutting mechanics of metallic glass is established after improving the yield criterion of M-C. In order to solve the above analytical model, the chip thickness and width were measured after turning experiment, and the shear angle and tool chip friction angle in the analytical model were obtained based on the least work principle. The calculation formula of the average temperature on the cutting surface in the cutting model is given by using the thermodynamic analysis method to convert the work on the shear surface into the cutting temperature rise. The model is compared and verified by the measured data of cutting force. The experimental results show that under the same cutting parameters, the cutting force model is suitable for traditional crystalline metals, the cutting force model without considering the M-C criterion of cutting temperature rise, and the M-C criterion of cutting force model considering the influence of cutting temperature rise, the latter has the highest accuracy of calculation. Three The maximum error between the theoretical and measured values of the cutting force model is 14.8%, and the average error is 8.9%. Based on Tresca or Mises criterion, the error between the traditional analytical model and the measured results of cutting force is over 59%. The experimental results fully demonstrate the validity of the theoretical modeling work.
【學位授予單位】：燕山大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TG501

【引證文獻】

相關(guān)碩士學位論文 前2條

1 趙光光;Vit1型金屬玻璃正交切削的切削力及溫度場有限元仿真研究[D];燕山大學;2016年

2 陳燕;基于模量法則的銅鋯體系金屬玻璃設(shè)計及其性能研究[D];重慶師范大學;2016年

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本文編號：1343761