【摘要】：商品經(jīng)濟的快速發(fā)展，特別是網(wǎng)絡購物的流行，對緩沖包裝行業(yè)提出了更高的要求�？諝鈮|是一種既具有環(huán)保性又具有優(yōu)良緩沖性能的緩沖包裝材料，由聚合物薄膜包裹氣體而成。主要應用于電子產(chǎn)品、易碎產(chǎn)品等的內(nèi)層保護包裝。本文通過實驗和有限元分析相結合的方式，逐層深入地研究了薄膜材料的力學行為以及空氣墊的緩沖性能，為用有限元分析的方法進行緩沖包裝設計奠定了基礎。 考慮到薄膜高度非線性彈性，在連續(xù)介質(zhì)力學的基礎上，為薄膜材料建立了超彈性本構模型。將開發(fā)的本構模型通過用戶子程序UHYPER編譯到通用型非線性有限元軟件ABAQUS中，為數(shù)值模擬提供合適的材料模型。利用有限元軟件和開發(fā)的用戶子程序進行空氣墊的靜態(tài)壓縮模擬。模擬結果與實驗結果對比表明所提出的本構模型可以很好地描述空氣墊薄膜在靜態(tài)壓縮時的力學行為。 利用有限元法對空氣墊進行緩沖吸能特性分析，討論了不同充氣壓力的影響。結果表明空氣墊充氣壓力越大，承載能力越大。但在一定范圍內(nèi)充氣壓力越小，靜態(tài)緩沖系數(shù)越小，緩沖性能越好。 考慮空氣墊在應用過程中的實際工況，進行空氣墊的動態(tài)壓縮實驗，探討在相同的沖擊能量下，空氣墊充氣壓力對緩沖性能的影響。在超彈性本構模型的基礎上，考慮應變速率對空氣墊薄膜力學行為的影響，，進一步構建粘超彈性本構。通過擬合實驗數(shù)據(jù)得到模型中的參數(shù)值，并成功對0.064/s的應變速率下的薄膜力學行為進行預測。
[Abstract]:The rapid development of commodity economy, especially the popularity of online shopping, put forward higher requirements for cushioning packaging industry. Air cushion is a kind of cushioning packaging material with environmental protection and excellent cushioning performance, which is made of polymer film coated with gas. Mainly used in electronic products, fragile products and other inner layer protection packaging. Through the combination of experiment and finite element analysis, the mechanical behavior of thin film material and the cushioning performance of air cushion are studied layer by layer in this paper, which lays a foundation for the design of cushioning package by finite element analysis. Considering the highly nonlinear elasticity of thin film, the hyperelastic constitutive model of thin film material is established on the basis of continuum mechanics. The developed constitutive model is compiled into the general nonlinear finite element software ABAQUS by user subprogram UHYPER to provide a suitable material model for numerical simulation. The static compression simulation of air cushion is carried out by using finite element software and user subroutine. The comparison between the simulation results and the experimental results shows that the proposed constitutive model can well describe the mechanical behavior of the air cushion film under static compression. The cushioning and energy absorption characteristics of air cushion are analyzed by finite element method, and the effects of different inflatable pressures are discussed. The results show that the higher the inflatable pressure of the air cushion is, the greater the bearing capacity is. However, the smaller the inflatable pressure is, the smaller the static buffering coefficient is, and the better the buffering performance is. Considering the actual working condition of the air cushion in application, the dynamic compression experiment of the air cushion is carried out, and the influence of the air cushion inflatable pressure on the cushioning performance under the same impact energy is discussed. Based on the hyperelastic constitutive model and considering the effect of strain rate on the mechanical behavior of air cushion film, the viscoelastic hyperelastic constitutive model is further constructed. The parameters of the model are obtained by fitting the experimental data, and the mechanical behavior of the film at the strain rate of 0.064? s is predicted successfully.
【學位授予單位】：上海交通大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TB485.1;TB383.2

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