Microcellular Ethylene–Vinyl Acetate Copolymer Foam: Life Prediction Under Reciprocating Compression

Abstract

The fatigue law of ethylene–vinyl acetate copolymer (EVA) foam has investigated through its fatigue characteristics of reciprocating compression, to construct its fatigue life prediction model. EVA foam samples are prepared by supercritical fluid foaming method. The MTS‐831 material testing machine is used to perform a reciprocating compression fatigue test with a constant load of 100 000 cycles. The constructed fatigue life prediction model is based on the relationship between the average modulus and the strain. The parameters of the model are determined by the results of reciprocating compression testing. This model can predict the fatigue results after 100 000 cycles of reciprocating compression with the results of 1000th cycle. The results suggest that the plastic deformation increases with the increase of cycles, the average modulus increases with the increase of gel content, and the relationship between stress and strain is nonlinear. Error analysis and model verification confirms that the predicted value is consistent with the experimental results, and the model predicted results are accurate and credible.

Rheological behaviors and foaming behaviors of crosslinked ethylene–vinyl acetate with polyfunctional monomers

“…EVA foam is generally manufactured by the expansion of the gas dissolved in the matrix melt. The gas can be generated by the separation of a supercritical gas, 7 the vaporization of a volatile liquid, 8 or a gas release by undergoing a chemical reaction of a chemical blowing agent 9,10 . Azodicarbonamide (ADC) is the most employed chemical blowing agent for EVA due to its advantages of high gas yield, nontoxic, and flame self‐extinguishing 11,12 .…”

Mechanical Behavior of Closed-Cell Ethylene-Vinyl Acetate Foam under Compression

“…Lutfi et al [3] reported the compression and tension behaviors of polyurethane, EVA, Pelite™, and a combination of polyurethane and EVA with a given medium density. Xin [4] and Wen et al [5] explored the mechanical performance and life prediction of EVA foams with five densities of 132, 151, 172, 188, and 209 kg/m 3 under repetitive compressions. Duncan et al [6] highlighted that the mechanical properties of foam materials are closely related to the compressive strain rate.…”