本文選題：鋁合金擠壓管　切入點(diǎn)：各向異性　出處：《金屬學(xué)報(bào)》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?yán)碚撃Ｐ痛嬖诘臏y試物理量過多且實(shí)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(xué)性能的新方法:一點(diǎn)法。利用圓幾何輪廓線為顯性函數(shù)表達(dá)式的特征,推導(dǎo)了脹形過程中最高點(diǎn)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(diǎn)脹形高度,即可獲得材料雙向加載下的力學(xué)性能,為建立一個(gè)簡單可靠且能在線實(shí)時(shí)測量的材料力學(xué)性能測試方法奠定了基礎(chǔ)。并利用所建立的測試方法進(jìn)行了AA6061鋁合金擠壓管坯的脹形實(shí)驗(yàn)。結(jié)果表明:管坯自由脹形時(shí),其最高點(diǎn)實(shí)時(shí)壁厚和曲率半徑均可表示為最高點(diǎn)脹形高度的顯示函數(shù)。輪廓形狀理論模型的預(yù)測精度隨膨脹率的增大先提高后降低,膨脹率約為13%時(shí)預(yù)測精度最高,當(dāng)膨脹率超過20%后,預(yù)測精度開始下降,但最大誤差不超過±0.9%。最高點(diǎn)實(shí)時(shí)壁厚理論模型的預(yù)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(shí),差異很小,預(yù)測誤差均不超過0.8%,這對保證雙向加載條件下的力學(xué)性能測試精度是非常有益的。一點(diǎn)法可同時(shí)測得環(huán)向和軸向的應(yīng)力應(yīng)變分量,這為進(jìn)一步分析各向異性對復(fù)雜應(yīng)力狀態(tài)下材料的流動(dòng)及后繼屈服奠定了基礎(chǔ)。
[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(xué)(威海)材料科學(xué)與工程學(xué)院;哈爾濱工業(yè)大學(xué)材料科學(xué)與工程學(xué)院;哈爾濱工業(yè)大學(xué)精密工程研究所;
【基金】：國家自然科學(xué)基金項(xiàng)目Nos.51405102和51475121 中國博士后科學(xué)基金項(xiàng)目No.2015M570286 中央高�；究蒲袠I(yè)務(wù)費(fèi)專項(xiàng)資金項(xiàng)目No.HIT.NSRIF.2016093 哈爾濱工業(yè)大學(xué)(威海)�？茖W(xué)研究基金項(xiàng)目No.HIT(WH)201414~~
【分類號】：TG115.5

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