Mechanical Models of Cellular Solids, Parameters ：多孔固体的力学模型，参数精品.pdfVIP

MECHANICAL MODELS OF CELLULAR SOLIDS, PARAMETERS IDENTIFICATION FROM EXPERIMENTAL TESTS Massimiliano Avalle Giovanni Belingardi Andrea Ibba Dipartimento di Meccanica, Politecnico di Torino Italy Paper Number 05-0438 ABSTRACT 1. INTRODUCTION Cellular solids are largely used in many The increasing request of more performing and structural applications to absorb and dissipate energy, safer vehicles has given great importance to cellular due to their light weight and high energy absorption solid materials in automotive industry. This kind of capability. materials is successfully used in vehicles in order to The appropriate design of mechanical pieces minimise the weight of structural components and to made of structural foams must be done on the basis of improve the safety through the absorption of impact the kind of impact, the energy involved and the energy in crash events. maximum admissible stress. In the design In this second type of application cellular solids development it is of highest importance the choice of are used to absorb impacts between vehicle and the proper type of foam at the proper density level. external obstacles and the consequent internal This is based on stress-strain behaviour that can be impacts of the passengers against the body structure predicted by means of test curves and models. of the vehicle. In both cases cellular solid The parameters of two cellular solids models for components should be designed in order to control EPP, PUR, EPS and NORYL GTX foams have been the deceleration of the impacting parts (vehicle or identified by means of experiment