纸塑组合缓冲结构性能及设计方法研究

发布时间：2018-05-12 10:19

本文选题：组合缓冲结构 + 等效缓冲系数　；参考：《湖南工业大学》2014年硕士论文

【摘要】：市场上出现多种缓冲材料组合使用的缓冲包装衬垫，特别是纸质类缓冲材料和塑料类缓冲材料的组合使用。组合缓冲结构结合了多种材料的优点，能满足包装的多方面要求。然而，现有的文献和资料中针对组合缓冲结构的设计方法却非常缺乏。为此，本文拟针对组合缓冲衬垫提出等效缓冲系数，并基于等效缓冲系数进行公式推导，提出一种针对组合缓冲结构的设计方法。基于运输包装缓冲设计理论及知识体系，提出等效缓冲系数的概念，，推导了不同材料串联组合及并联组合缓冲材料的等效缓冲系数公式，并得到了组合后等效缓冲系数的取值范围。组合后等效缓冲系数取值区域介于两种组合材料缓冲系数之间；该等效缓冲系数公式以不同材料的缓冲性能参数及比例参数表达，既适用于线性材料，也适用于非线性材料，具有较强的普适性，该等效缓冲系数公式的提出为叠置组合缓冲衬垫的设计提供了依据。基于等效缓冲系数公式，提出一种组合缓冲结构设计方法和具体步骤，重点对纸塑组合的衬垫设计步骤进行了探讨，由于纸质类缓冲材料具有极大的塑性和不可确定性，故而应注意材料的应力适用范围，纸质类缓冲材料的应力适用范围应是屈曲载荷前的线弹性阶段。利用ANSYS/LS-DYNA软件进行跌落仿真，分别对相同衬垫厚度的EPE/蜂窝、EPE、蜂窝三类缓冲衬垫进行跌落仿真分析，得到跌落冲击时的峰值加速度，将仿真结果与脆值进行比较。结果表明：EPE/蜂窝组合结构的跌落峰值加速度小于产品的脆值，从而验证基于等效缓冲系数的组合缓冲设计方法的可行性；EPE/蜂窝组合结构的峰值加速度介于EPE和蜂窝之间，说明组合后的缓冲性能介于EPE和蜂窝纸板之间，其仿真结果符合组合结构的缓冲性能介于两种材料之间的理论。为了验证基于等效缓冲系数的组合缓冲设计方法的可行性，利用缓冲材料动态压缩实验方法，对EPE/蜂窝的组合衬垫进行了动态冲击试验，将试验得到的峰值加速度G与理论计算Gmax值进行比较。结果表明：试验峰值加速度G小于理论计算Gmax值，则认为基于缓冲系数的组合缓冲结构设计方法具有可行性，且设计结果是偏保守的。所取得的研究成果对组合缓冲结构的设计提供了理论依据和设计方法，并为组合缓冲结构的推广应用奠定了基础。
[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.
【学位授予单位】：湖南工业大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TB484

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