TheJ-integral fracture toughness of PP/CaCO3composites

✍ Scribed by Li Dongming; Zheng Wenge; Qi Zongneng

• Publisher: Springer
• Year: 1994
• Tongue: English
• Weight: 417 KB
• Volume: 29
• Category: Article
• ISSN: 0022-2461
• DOI: 10.1007/bf00357345

✦ Synopsis

The J-integral method was introduced to investigate the fracture process of PP/CaC03 composites. The results showed that the resistance of PP/CaC03 composites to crack initiation and propagation was greatly improved with the addition of CaC03 filler. Large scale plasticity was caused in PP/CaC03 composites, from which a large amount of energy was absorbed by the PP matrix. The reason for the increase in the fracture toughness of PP/CaC03 composites was attributed to the partial micro-drawing ahead of the crack tip in the PP matrix, which was formed by the stress concentration caused by the filler particles in the PP matrix and/or by the interfacial debonding between filler particles and the PP matrix. It was indicated that the presence of CaC03 filler could augment the ductility of composites locally, resulting in higher fracture energy in the crack initiation and propagation of the PP/CaC03 composites in a certain CaC03 content range.