外文翻譯--發(fā)動(dòng)機(jī)曲軸箱軸承座裂解加工數(shù)值分析-其他專業(yè)-資料下載頁(yè)
2025-01-19 10:00本頁(yè)面
【導(dǎo)讀】譯文的意思基本正確，語(yǔ)句較通順。專業(yè)性術(shù)語(yǔ)的翻譯也。譯文的數(shù)量已超過(guò)學(xué)校規(guī)定的要求。有較強(qiáng)的科技文獻(xiàn)的閱讀理解與翻譯能力。預(yù)先精確計(jì)算裂解力參數(shù),對(duì)于裂解設(shè)備設(shè)計(jì)及工藝過(guò)程的制定至關(guān)重要。行數(shù)值模擬,得出了裂解力與J積分的關(guān)系曲線。根據(jù)J積分值與斷裂韌性的關(guān)系,確定了臨界J積分,采用線性插值的方法獲得了裂解力,并進(jìn)行了實(shí)驗(yàn)研究。求且要保證裂解質(zhì)量。汽車發(fā)動(dòng)機(jī)曲軸箱軸承座的加工與連桿軸承孔的加工在結(jié)。發(fā)動(dòng)機(jī)缸體多采用優(yōu)質(zhì)灰鑄鐵、球墨鑄鐵、結(jié)合面裝配,結(jié)合面積大,承載能力提高,尤其是抗剪切能力大幅提高。刀具種類,降低刀具成本;5)節(jié)約動(dòng)能40%;6)簡(jiǎn)化工藝,使廢品率明顯下降。斷裂達(dá)到蓋和體分離的目的。國(guó)家已達(dá)到了實(shí)用階段。內(nèi)尚未見(jiàn)相關(guān)報(bào)道,吉林大學(xué)已開(kāi)展這項(xiàng)研究工作,取得了初步的研究成果。過(guò)程中的受力特點(diǎn),捷達(dá)轎車四缸發(fā)動(dòng)機(jī)箱體軸承座的簡(jiǎn)化模型。各軸承座受力特點(diǎn)相同,取其中之一進(jìn)行模擬分析即可。
【正文】 symmetry plane and noncrack area contact connected with the Touching the mand and finally activated IDboundary conds mand, the plete finite element mesh model and boundary conditions shown in Figure 5 ( d) as shown. For the elasticplastic fracture mechanics, crack tip stress and strain fields generated 1 / r singularity, twodimensional case, this singularity can be overlapped with the three node triangular element simulation, while the analysis of this threedimensional model , can be used 20node degenerated block units constructed to simulate the crack front singular stress field. In this paper, namely, expansion of J integral method algorithm to calculate the Jintegral crack, and through topology discovery (Topology Search) automatically define the path integral. Topology search method refers to the program automatically selects the first point associated with the crack tip for all units outside the contour line as the first integral path, and then the further search and the first integral paths linked to the outer cell contour points as the second path, and so on, can be more easily determine the path points. Analysis of a 30stepstep loading, each step increment 4. 6. A total of 43 nodes in the crack tip, J integral path is defined as the number 6, the crack tip node tolerance set to 0. 001mm. The simulation has been cracking force corresponding to each incremental step for all nodes in the cracktip Jintegral data. In order to verify the correct simulation analysis, in the CSS288300 material testing machine with specially designed device (see Figure 8) for the experimental verification of equipment nominal maximum pulling force of 300 KN, the puter39。s signal acquisition rate of 200 times / s, test temperature at room temperature a rate of 4 mm / s. Tank size specimen cracking: cracking groove depth h = 0. 5 mm, spread angle 2α = 20 176。, curvature radius r = 0. 2 mm. We can see from the calculation, simulation and experimental value of the error as follows: μ = (137 129. 32) / 137 100% = 5. 6% As J IC corresponding to cracking force is actually crack initiation of the cracking strength, that is to meet the precrack slots crack initiation of the minimum force. In theory, crack after rapidly expanding until the fracture, depending on the flexibility of the release of crack growth can be the satisfaction of crack propagation on the surface energy requirements. If the elasticity of the release can be greater than the surface energy, crack can automatically expand。 the contrary, you need to improve the external force to overe the surface energy, crack in order to automatically expand. Force can be seen cracking up Cracking strength threshold, does not necessarily guarantee automatic expansion of crack, which is determined by the properties of the materials. Therefore, this article will reach the threshold when the cracking force strength as a fracture cleavage cracking strength (that is, automatic expansion of crack force) with the experimental cleavage fracture strength results were pared, it will undoubtedly bring about some error. Hydraulic circuit ponents in the library Figure 12 The structure chart is posed of hydraulic excavator model graphics part, the following model is from a proprietary library selected, connect and input parameters. Notes from the cylinder and motor to be able to connect as shown The input signal, such as, excavators, motorrelated signal is given by the frame. The diameter of the measurement concrete . For the mechanical part of the excavator, as long as the ponents shown in Figure 12 directly connected with the hydraulic ponents. Crankcase bearing cracker processing technology along with the development of automobile industry produced a new type of processing technology. Application software engine crankcase bearing deposition process of the numerical analysis, using 20node degenerated is block units constructed to simulate the crack tip singular point of singularity, arrived at cracking the relationship between force and J integral curve, according to T380 critical J integral value of the material to determine the processing power required for cracking.
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