本文關(guān)鍵詞： 集裝箱地板 三點(diǎn)彎試驗(yàn) 分層失效 用戶子程序　出處：《華南理工大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：傳統(tǒng)集裝箱地板是19層的膠合板,由熱帶闊葉樹木制作而成。然而隨著硬木資源的逐年銳減以及地板生產(chǎn)工藝的落后,集裝箱地板產(chǎn)業(yè)的發(fā)展已經(jīng)受到嚴(yán)重的制約,因此對集裝箱地板可替代材料以及結(jié)構(gòu)優(yōu)化的研究迫在眉睫。以承載件彎曲變形時正應(yīng)力的分布規(guī)律為依據(jù),選擇了三明治夾芯輕質(zhì)結(jié)構(gòu)替代膠合板作為集裝箱地板的結(jié)構(gòu);其次從綜合性能和制作成本兩方面來考慮,提出了以玻璃纖維增強(qiáng)環(huán)氧樹脂基復(fù)合材料為面板,abs塑料為芯層的夾層結(jié)構(gòu)復(fù)合板。根據(jù)玻璃纖維和環(huán)氧樹脂固化劑的彈性常數(shù),利用串聯(lián)和并聯(lián)模型預(yù)測得到單向纖維板的工程彈性常數(shù)。以復(fù)合材料分層失效準(zhǔn)則為評價依據(jù),對新型集裝箱地板進(jìn)行了基于正交試驗(yàn)設(shè)計(jì)的數(shù)值模擬,得到4組最優(yōu)水平組合的方案。由集裝箱地板的使用要求和常見的破壞模式確定剛度約束和粘接強(qiáng)度兩個約束條件,選取面層的厚度和芯層的密度作為夾層結(jié)構(gòu)板的設(shè)計(jì)變量,以夾層結(jié)構(gòu)板的比抗彎剛度作為目標(biāo)函數(shù),編寫優(yōu)化程序以得到4組方案的最佳工藝參數(shù)。采取排水法測出了環(huán)氧樹脂固化劑和玻璃纖維的密度值,并對不同配比的樹脂基體進(jìn)行了壓縮試驗(yàn),以確定最佳的試驗(yàn)配比。根據(jù)4組不同纖維角度和體積含量的方案,對新型夾層結(jié)構(gòu)地板的三點(diǎn)彎試驗(yàn)進(jìn)行了仿真模擬,仿真結(jié)果表明,4組新型夾層結(jié)構(gòu)試驗(yàn)板均能滿足設(shè)計(jì)要求。制備相應(yīng)的夾層結(jié)構(gòu)板,并進(jìn)行試驗(yàn)樣板的三點(diǎn)彎試驗(yàn)驗(yàn)證仿真結(jié)果的正確性。建立纖維增強(qiáng)復(fù)合材料單參數(shù)的塑性模型,并利用向后返回的歐拉方法改進(jìn)材料的應(yīng)力更新算法�；谠撍惴ɡ肍ORTRAN語言編寫了用戶單元子程序UEL,并在有限元軟件ABAQUS上通過了編譯,接著測試了該子程序在單軸壓縮和反復(fù)加載兩種不同工況下的力學(xué)性能,計(jì)算結(jié)果與其他文獻(xiàn)的試驗(yàn)結(jié)果相一致,說明開發(fā)出來的子程序精度符合實(shí)際工程的要求。最后將塑性子單元應(yīng)用在單向纖維增強(qiáng)復(fù)合材料板面內(nèi)受載的模擬中,使得模擬結(jié)果更加準(zhǔn)確。
[Abstract]:The traditional container floor is a 19-story plywood made from tropical broadleaved wood. However, with the decrease of hardwood resources year by year and the backwardness of flooring production technology, the development of container flooring industry has been seriously restricted. Therefore, it is urgent to study the substitute material and structure optimization of container flooring. Based on the normal stress distribution law of load-carrying parts during bending deformation, the sandwich sandwich sandwich light weight structure is chosen as the structure of container floor instead of plywood. Secondly, considering the comprehensive properties and the production cost, a sandwich structure composite plate with glass fiber reinforced epoxy resin matrix composite as the core layer was proposed. According to the elastic constants of glass fiber and epoxy resin curing agent, The engineering elastic constants of unidirectional fiberboard were predicted by using series and parallel models. Based on the delamination failure criterion of composite material, the numerical simulation of the new container floor was carried out based on orthogonal test design. Four groups of optimal horizontal combination schemes are obtained. The stiffness constraint and bonding strength are determined by the use requirements of container floor and common failure modes. The thickness of the surface layer and the density of the core layer are selected as the design variables of the sandwich structure plate, and the thickness of the surface layer and the density of the core layer are selected as the design variables of the sandwich structure plate. Taking the specific bending stiffness of sandwich structure plate as the objective function, an optimization program was compiled to obtain the best technological parameters of the four groups of schemes. The density values of epoxy resin curing agent and glass fiber were measured by drainage method. The compression test of resin matrix with different ratio was carried out to determine the optimum ratio. According to the four groups of different fiber angle and volume content, the three-point bending test of the new sandwich structure floor was simulated. The simulation results show that all of the four new sandwich structure test boards can meet the design requirements. The three-point bending test of the test sample was carried out to verify the correctness of the simulation results. A single parameter plastic model of fiber reinforced composites was established. The stress updating algorithm of materials is improved by backward Euler method. Based on this algorithm, the user unit subprogram UELL is written in FORTRAN language, and the program is compiled on the finite element software ABAQUS. Then the mechanical properties of the subroutine under two different conditions of uniaxial compression and repeated loading are tested. The calculated results are in agreement with the experimental results in other literatures. Finally, the plastic subelement is applied to the in-plane loading simulation of unidirectional fiber reinforced composite plate, which makes the simulation results more accurate.
【學(xué)位授予單位】：華南理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TB332

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