Performance Analysis Of Honeycomb Sandwich Arm Bent And Impulse Response

With_the development of modern science and technology research, materials, structure, mechanics and other fields deepened, honeycomb sandwich structure as a new structure in front of people. The new structure has a light weight, high strength, energy absorption and sound insulation and good. Honeycomb sandwich structure of these advantages it has been widely used in aerospace, automotive, construction and packaging engineering. Therefore, the study of the mechanical properties of honeycomb sandwich structure has been widespread concern engineering and academic fields.In the non-homogeneous materials such cellular material with the mechanical properties of the periodic structure analysis and research, they often select a representative volume element-as a single cell analysis and study. Usually analyzed and studied from two angles. The idea of using homogenization predicted equivalent elastic parameters of the honeycomb structure, so the heterogeneity of the material into a homogeneous material, this line of thinking belongs to the stiffness of the mechanical aspects of macroeconomic analysis. First, a single cell as the research object, the analysis unicellular microscopic stress-strain, and strength analysis using the appropriate strength failure criterion for whole honeycomb structure damage analysis and strength analysis, this line of thinking belongs to the scope of Micromechanics methods. Based on homogenization theory, the use of honeycomb core cell characterization deduced equivalent density and outer surfaces of the honeycomb core material equivalent elastic modulus expressions.Honeycomb on the arm, you can see the lower flange beam work, because the honeycomb core and tensile stiffness in the small moments structure, bending normal stress, compressive stress and torque from the inner surface of the main arm the upper and lower commitment honeycomb core is similar to the word web beams, shear bear only on the arm of honeycomb sandwich skin well play a supportive role to make a substantial increase in the bending stiffness of the structure. Honeycomb arm quasi-static three-point bending test, get a load of the theoretical relationship between the arm and the midpoint of the deflection, can in good agreement with the experimental results, and can predict the honeycomb sandwich beam in three-point bending state can withstand a maximum of loads. Honeycomb arm under the impact load dynamic response can be described by the joint impact of the dynamic characteristics and dynamic characteristics of honeycomb sandwich material impact beams.he honeycomb core material is a good energy absorbing material, which in addition to the stress-strain curve of the honeycomb core material on the outer surface of the compressive load in the yield point on a wide, but also related to the absorption of energy in the elastic deformation part of the process. Honeycomb arm absorbs energy impact load is divided into two parts:the first part is the energy absorbed by the structure due to injury, damage and fracture energy of these composite structures; second part of the energy and the elastic deformation of the whole structure and the structure of the overall momentum changes. Honeycomb impact loading arm, accurate calculation of the absorbed energy is very difficult. But the dissipation in the elastic deformation energy of the whole structure is to obtain quantitative estimate of the absorbed energy first established in ballistic composite structures under impact loading, honeycomb sandwich panels under impact conditions moment mathematical model analysis.