The Prediction of the Flexural Rigidity of Sandwich Foam Mouldings

High density polyethylene foams. IV. Flexural and tensile moduli of structural foams

“…In the second part of this series,2 we compared Young's modulus with different models for uniform foams. Of all the models used in our comparison, it was found that the differential scheme and Moore's simple empirical equation4 gave similar results and were best at predicting the data in the range of void volume fractions under study (0–55%). In this paper, a focus is made on the properties of uniform and structural foams, which are composed of foamed cores enclosed by unfoamed skins.…”

Predicting the Flexural Rigidity of Thermoplastic Structural Foams

“…4. The stress function analyses are more difficult to use than the idealized beam modulus but appear to be capable of providing accurate results even when the required Poisson ratio values must be estimated.…”

“…Appropriate corrections for slight non-linearities in the film density-exposure curves were obtained using solid calibration wedges attached to the foamed samples as shown in Figure 1. Section A represents the wide-flange or I-beam approximation commonly used to model sandwich moldings (2)(3)(4) and suggested for use with structural foams (5). It assumes a skin of thickness T and modulus E. and a core reduced in thickness by a factor E,/E..…”

Using Density Profiles to Predict the Flexural Modulus of Structural Polymer Foams

“…As a general case, a foam can be approximated by a homogeneous distribution of spherical gas cells inside a polymer matrix. Using this analogy, Boccaccini et al [22] showed that the simple square power-law [4][5][6] defined by:…”