本文選題：初始屈服點　切入點：Drucker-Prager準(zhǔn)則　出處：《固體力學(xué)學(xué)報》2017年05期 　論文類型：期刊論文

【摘要】：為完善井下彈道式煤矸分離方法的理論體系,對煤和矸石碰撞反彈過程中的彈塑性行為進(jìn)行研究.以Hertz接觸理論為基礎(chǔ),結(jié)合Drucker-Prager準(zhǔn)則確定了煤和矸石碰撞過程中初始屈服點相對位置的表達(dá)式,指出該位置與泊松比近似呈線性關(guān)系,并得到初始屈服時相對變形量、接觸力和相對速度的數(shù)學(xué)模型.基于線性強化彈塑性模型,得到接觸力與變形量的函數(shù)關(guān)系,并依據(jù)能量守恒定律,確定碰撞分離時刻的相對速度,進(jìn)而得到反彈距離的理論模型.在單顆粒沖撞實驗臺上對煤和矸石進(jìn)行碰撞反彈試驗,試驗表明:反彈距離隨初始速度的增加基本呈增大趨勢,當(dāng)初始速度較小、煤和矸石破碎較少時,采用材料參數(shù)平均值計算得到的反彈距離理論解與試驗平均值的一致性較好,當(dāng)煤和矸石有破碎產(chǎn)生時,由于能量的損失,試驗平均值小于理論解.
[Abstract]:In order to perfect the theoretical system of ballistic coal and gangue separation method, the elastoplastic behavior of coal and gangue during the collision and rebound process was studied. Based on the Hertz contact theory, the elastoplastic behavior of coal and gangue was studied. Based on the Drucker-Prager criterion, the expression of the relative position of the initial yield point in the process of coal and gangue collision is determined. It is pointed out that this position has a linear relationship with Poisson's ratio, and the relative deformation of the initial yield is obtained. Based on the linear enhanced elastoplastic model, the functional relationship between contact force and deformation is obtained, and the relative velocity at the time of collision separation is determined according to the law of conservation of energy. Then the theoretical model of the rebound distance is obtained. The impact rebound test of coal and gangue is carried out on a single particle collision test bench. The results show that the rebound distance increases with the increase of the initial velocity, and when the initial velocity is small, When coal and gangue are broken less, the theoretical solution of rebound distance calculated by the average material parameter is in good agreement with the experimental average. When coal and gangue are broken, the average value of test is smaller than the theoretical solution because of the loss of energy.
【作者單位】： 河南理工大學(xué)機械與動力工程學(xué)院;中國礦業(yè)大學(xué)機電學(xué)院;
【基金】：國家自然科學(xué)基金項目(51404096)資助
【分類號】：O344.1

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