本文選題：組合緩沖結(jié)構(gòu) + 等效緩沖系數(shù)��； 參考：《湖南工業(yè)大學(xué)》2014年碩士論文

【摘要】：市場上出現(xiàn)多種緩沖材料組合使用的緩沖包裝襯墊，特別是紙質(zhì)類緩沖材料和塑料類緩沖材料的組合使用。組合緩沖結(jié)構(gòu)結(jié)合了多種材料的優(yōu)點，能滿足包裝的多方面要求。 然而，現(xiàn)有的文獻(xiàn)和資料中針對組合緩沖結(jié)構(gòu)的設(shè)計方法卻非常缺乏。為此，本文擬針對組合緩沖襯墊提出等效緩沖系數(shù)，并基于等效緩沖系數(shù)進(jìn)行公式推導(dǎo)，提出一種針對組合緩沖結(jié)構(gòu)的設(shè)計方法。 基于運輸包裝緩沖設(shè)計理論及知識體系，提出等效緩沖系數(shù)的概念，，推導(dǎo)了不同材料串聯(lián)組合及并聯(lián)組合緩沖材料的等效緩沖系數(shù)公式，并得到了組合后等效緩沖系數(shù)的取值范圍。組合后等效緩沖系數(shù)取值區(qū)域介于兩種組合材料緩沖系數(shù)之間；該等效緩沖系數(shù)公式以不同材料的緩沖性能參數(shù)及比例參數(shù)表達(dá)，既適用于線性材料，也適用于非線性材料，具有較強(qiáng)的普適性，該等效緩沖系數(shù)公式的提出為疊置組合緩沖襯墊的設(shè)計提供了依據(jù)。 基于等效緩沖系數(shù)公式，提出一種組合緩沖結(jié)構(gòu)設(shè)計方法和具體步驟，重點對紙塑組合的襯墊設(shè)計步驟進(jìn)行了探討，由于紙質(zhì)類緩沖材料具有極大的塑性和不可確定性，故而應(yīng)注意材料的應(yīng)力適用范圍，紙質(zhì)類緩沖材料的應(yīng)力適用范圍應(yīng)是屈曲載荷前的線彈性階段。 利用ANSYS/LS-DYNA軟件進(jìn)行跌落仿真，分別對相同襯墊厚度的EPE/蜂窩、EPE、蜂窩三類緩沖襯墊進(jìn)行跌落仿真分析，得到跌落沖擊時的峰值加速度，將仿真結(jié)果與脆值進(jìn)行比較。結(jié)果表明：EPE/蜂窩組合結(jié)構(gòu)的跌落峰值加速度小于產(chǎn)品的脆值，從而驗證基于等效緩沖系數(shù)的組合緩沖設(shè)計方法的可行性；EPE/蜂窩組合結(jié)構(gòu)的峰值加速度介于EPE和蜂窩之間，說明組合后的緩沖性能介于EPE和蜂窩紙板之間，其仿真結(jié)果符合組合結(jié)構(gòu)的緩沖性能介于兩種材料之間的理論。 為了驗證基于等效緩沖系數(shù)的組合緩沖設(shè)計方法的可行性，利用緩沖材料動態(tài)壓縮實驗方法，對EPE/蜂窩的組合襯墊進(jìn)行了動態(tài)沖擊試驗，將試驗得到的峰值加速度G與理論計算Gmax值進(jìn)行比較。結(jié)果表明：試驗峰值加速度G小于理論計算Gmax值，則認(rèn)為基于緩沖系數(shù)的組合緩沖結(jié)構(gòu)設(shè)計方法具有可行性，且設(shè)計結(jié)果是偏保守的。 所取得的研究成果對組合緩沖結(jié)構(gòu)的設(shè)計提供了理論依據(jù)和設(shè)計方法，并為組合緩沖結(jié)構(gòu)的推廣應(yīng)用奠定了基礎(chǔ)。
[Abstract]:In the market, there are many kinds of cushioning packaging gaskets, especially the combination of paper cushioning materials and plastic cushioning materials. The combined cushioning structure combines the advantages of many materials and can meet the requirements of packaging. However, the existing literature and data for the design of composite buffer structure is very lacking. For this reason, this paper proposes an equivalent buffer coefficient for the combined cushioning liner, deduces the formula based on the equivalent buffer coefficient, and puts forward a design method for the combined buffer structure. Based on the theory of transportation packaging buffer design and knowledge system, the concept of equivalent buffer coefficient is put forward, and the formula of equivalent buffer coefficient of different material series combination and parallel combination buffer material is derived. The range of equivalent buffer coefficient after combination is obtained. The range of the equivalent buffer coefficient after combination is between the two kinds of composite materials, and the formula is expressed by the buffer performance parameters and the proportional parameters of different materials, which is applicable to both linear and nonlinear materials. The formula provides a basis for the design of overlay combined cushioning cushion. Based on the formula of equivalent buffer coefficient, this paper puts forward a design method and concrete steps of combined cushioning structure, especially discusses the design steps of paper plastic combination liner, because of the great plasticity and uncertainty of paper cushioning materials. Therefore, attention should be paid to the application range of the stress of the material, and the applicable range of the stress of the paper buffer material should be the linear elastic stage before the buckling load. The drop simulation of EPE/ honeycomb and three kinds of honeycomb cushioning gaskets with the same cushion thickness was carried out by using ANSYS/LS-DYNA software. The peak acceleration of drop impact was obtained and the simulation results were compared with the brittle values. The results show that the drop peak acceleration of the composite structure is smaller than the brittle value of the product. The feasibility of the combined buffer design method based on equivalent buffer coefficient is verified. The peak acceleration of the composite structure is between EPE and honeycomb. The results show that the cushioning performance of the composite structure is between EPE and honeycomb paperboard, and the simulation results agree with the theory that the cushioning performance of the composite structure is between two kinds of materials. In order to verify the feasibility of the combined buffer design method based on equivalent buffer coefficient, the dynamic impact test of EPE/ honeycomb composite cushion was carried out by using the dynamic compression experiment method of buffer material. The peak acceleration G obtained from the experiment is compared with the calculated Gmax value. The results show that the experimental peak acceleration G is less than the theoretical calculated Gmax value, and it is considered that the design method based on the buffer coefficient is feasible and the design results are conservative. The research results provide the theoretical basis and design method for the design of the composite buffer structure and lay a foundation for the popularization and application of the composite buffer structure.
【學(xué)位授予單位】：湖南工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TB484

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