本文選題：鋁合金擠壓管　切入點：各向異性　出處：《金屬學報》2017年09期 　論文類型：期刊論文

【摘要】：為解決各向異性材料雙向加載性能測試理論模型存在的測試物理量過多且實測困難的問題,提出了一種采用管狀試樣脹形直接測試雙向加載力學性能的新方法:一點法。利用圓幾何輪廓線為顯性函數表達式的特征,推導了脹形過程中最高點軸向曲率半徑和壁厚理論模型。僅需在脹形過程中測量最高點脹形高度,即可獲得材料雙向加載下的力學性能,為建立一個簡單可靠且能在線實時測量的材料力學性能測試方法奠定了基礎。并利用所建立的測試方法進行了AA6061鋁合金擠壓管坯的脹形實驗。結果表明:管坯自由脹形時,其最高點實時壁厚和曲率半徑均可表示為最高點脹形高度的顯示函數。輪廓形狀理論模型的預測精度隨膨脹率的增大先提高后降低,膨脹率約為13%時預測精度最高,當膨脹率超過20%后,預測精度開始下降,但最大誤差不超過±0.9%。最高點實時壁厚理論模型的預測精度基本不受試件幾何尺寸的影響,長徑比和徑厚比改變時,差異很小,預測誤差均不超過0.8%,這對保證雙向加載條件下的力學性能測試精度是非常有益的。一點法可同時測得環(huán)向和軸向的應力應變分量,這為進一步分析各向異性對復雜應力狀態(tài)下材料的流動及后繼屈服奠定了基礎。
[Abstract]:In order to solve the problem that the testing physical quantity is too much and the measurement is difficult in the theoretical model of anisotropic material under biaxial loading, In this paper, a new method for directly measuring the mechanical properties of tubular specimens under biaxial loading is proposed: the one-point method. Using the characteristic of the explicit function expression of circular geometric contours, a new method is proposed to measure the mechanical properties of tubular specimens directly under biaxial loading. The theoretical model of axial curvature radius and wall thickness of the highest point in bulging process is derived. The mechanical properties of the material under bidirectional loading can be obtained by measuring the height of the highest point bulging in the process of bulging. It lays a foundation for the establishment of a simple, reliable and on-line testing method for mechanical properties of materials. The bulging experiment of AA6061 aluminum alloy extruded tube billet is carried out by using the established test method. The results show that when the tube billet bulges freely, The real time wall thickness and curvature radius of the highest point can be expressed as the display functions of the height of the highest bulge. The prediction accuracy of the contour shape theoretical model increases first and then decreases with the increase of the expansion rate, and the prediction accuracy is the highest when the expansion rate is about 13. When the expansion ratio exceeds 20%, the prediction accuracy begins to decrease, but the maximum error is not more than 鹵0.9.The prediction accuracy of the theoretical model of real-time wall thickness at the highest point is basically independent of the geometric dimension of the specimen, but the difference is very small when the ratio of length to diameter and the ratio of diameter to thickness vary. The prediction error is not more than 0.80.This is very helpful to ensure the accuracy of mechanical properties measurement under bidirectional loading. The one-point method can measure the stress and strain components in both circumferential and axial directions at the same time. This lays a foundation for further analysis of anisotropic flow and subsequent yield of materials under complex stress state.
【作者單位】： 哈爾濱工業(yè)大學(威海)材料科學與工程學院;哈爾濱工業(yè)大學材料科學與工程學院;哈爾濱工業(yè)大學精密工程研究所;
【基金】：國家自然科學基金項目Nos.51405102和51475121 中國博士后科學基金項目No.2015M570286 中央高�；究蒲袠I(yè)務費專項資金項目No.HIT.NSRIF.2016093 哈爾濱工業(yè)大學(威海)�？茖W研究基金項目No.HIT(WH)201414~~
【分類號】：TG115.5

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