摘要:

AbstractStiffness matrices are predicted, using the Halpin‐Tsai laminate analogy, at different locations in 4 short glass‐fiber‐reinforced thermoplastic moldings, and the resulting anisotropy and inhomogeneity discussed, relative to quasi‐isotropic values. The predictions are based on actual material structure as obtained from contact microradiographs. Considerable anisotropy and inhomogeneity are noted. The response of the materials to tensile, flexure, and shear loads is calculated and it is shown that this deviates to a lesser degree from a quasiisotropic response. Finally the load deformation behavior in plate bending and twisting are predicted using both a quasiisotropic model and the stiffness properties based on actual structure and compared with previously available experimental data. It is concluded that, in the absence of a predictive approach to fiber orientation in short‐glass‐fiber‐reinforced thermoplastic moldings, the use of quasi‐isotropic stiffness data provides an acceptable means of performing deformation design analysis. Based on the analysis of the moldings considered, the quasi‐isotropic assumption could be expected to introduce errors of less than 20 percent in deformation predictions fo

ISSN:0272-8397    

DOI:10.1002/pc.750050112

出版商:Society of Plastics Engineers, Inc.    

年代:1984

数据来源: WILEY

摘要:

AbstractFilled high‐density‐polyethylene (HDPE) films for packaging applications have been developed. These films are of low permeability, are water and grease resistant, and can be heat‐sealed like HDPE films but have stiffness, deadfold, cuttability, and appearance similar to those of paper. The films are produced in thicknesses of 10 to 100 + μm by the standard film blowing technique. The effect of the filler type, resin parameters, and film blowing process variables on the resultant filled film properties is discussed. The commercialization of filled films and the market acceptance of the products is also briefly elaborate

ISSN:0272-8397    

DOI:10.1002/pc.750050113

出版商:Society of Plastics Engineers, Inc.    

年代:1984

数据来源: WILEY

摘要:

AbstractThe molding of fiber‐reinforced thermoset components is a complex process involving a highly exothermic chemical reaction, which takes place in the presence of flow and thermal gradients. The flow in turn is complicated by time‐ and temperature‐dependent rheological characteristics. The industry has grown largely on the basis of empirical developments. However, numerous problems do remain which require increased understanding for solution. This report reviews work underway in numerous laboratories to characterize the flow and cure of sheet molding compounds and phenomena associated with these processes such as orientation, mechanical properties, residual internal stresses, mold fill, and surface de

ISSN:0272-8397    

DOI:10.1002/pc.750050114

出版商:Society of Plastics Engineers, Inc.    

年代:1984

数据来源: WILEY

ISSN:0272-8397    

DOI:10.1002/pc.750050115

出版商:Society of Plastics Engineers, Inc.    

年代:1984

数据来源: WILEY

ISSN:0272-8397    

DOI:10.1002/pc.750050116

出版商:Society of Plastics Engineers, Inc.    

年代:1984

数据来源: WILEY

ISSN:0272-8397    

DOI:10.1002/pc.750050101

出版商:Society of Plastics Engineers, Inc.    

年代:1984

数据来源: WILEY