(1. 河南理工大學(xué) 能源科學(xué)與工程學(xué)院，焦作 454003；
2. 潞安集團余吾煤業(yè)公司，長治 046103)
摘 要: 為了考察含有預(yù)制裂縫的圓盤試樣在SHPB系統(tǒng)上受線性增加沖擊荷載作用過程中的應(yīng)力平衡性，采用ANASYS有限元軟件對圓盤試樣的動態(tài)沖擊進(jìn)行數(shù)值模擬，獲得圓盤的動態(tài)應(yīng)力時間歷程，對圓盤試樣兩個加載平臺及加載直徑韌帶上節(jié)點的應(yīng)力進(jìn)行定量對比分析，提出確定動態(tài)應(yīng)力平衡性判定的方法。結(jié)果表明：圓盤靠近入射端接觸平臺面上點的應(yīng)力一致，而靠近透射端接觸平臺不同點的應(yīng)力差異卻非常大，盡管裂紋尖端附近節(jié)點的拉應(yīng)力值較為接近，但在沖擊載荷作用過程中，圓盤加載直徑韌帶上對稱部分的節(jié)點動態(tài)應(yīng)力始終無法達(dá)到平衡，較小的應(yīng)力差異就能引起應(yīng)力平衡度量值較為嚴(yán)重的振蕩。這有助于正確認(rèn)識巖石動態(tài)沖擊破壞過程和提出準(zhǔn)確測試巖石動態(tài)斷裂韌度的方法。
關(guān)鍵字: 分離霍普金森壓桿；應(yīng)力平衡；圓盤試樣；加載直徑；動態(tài)斷裂韌度
（1. College of Energy Science and Engineering, Henan Polytechnic University, Jiaozuo 454003, China;
2. Yuwu Coal Industry Corporation, Lu’an Group, Changzhi 046103, China）
Abstract:In order to analyze the stress balance of the prefabricated crack disc specimen impacted under linear increase impact loads in split Hopkinson pressure bar (SHPB) impact system, the dynamic numerical simulation were performed by ANASYS finite element software. The whole dynamic stress history of the disc specimen was got, and the node dynamic stress of two loading platforms and the loading diameter ligament of the disc specimen were compared and analyzed quantitatively. The method to determine dynamic stress equilibrium was introduced, too. The results show that the nodes stress of the platform surface near the incidence end are consistent, while the one near the transmission end are obviously different. Although the node stress near crack tip is relatively close, the dynamic stress of the disc loading diameter ligament on symmetry part are always unable to keep balance, and smaller difference can cause serious stress oscillation. It is helpful to understand the rock dynamic failure and propose a correct test method to determine the dynamic fracture toughness.
Key words: split Hopkinson pressure bar; stress equilibrium；disc specimen；loading diameter；dynamic fracture toughness
