Mechanical behaviour of PVC/CaCO3 Particulate Composites - Influence of Temperature

作者：Costa J D M^*; Capela C; Ferreira J A M

来源：STRAIN, 2011, 47(s1): E292-E304.

DOI：10.1111/j.1475-1305.2009.00624.x

• flexural strength
• fracture toughness
• particulate composites
• Young's modulus

This paper is concerned with the study of temperature influence on Young's modulus, ultimate strength and fracture toughness properties of PVC/CaCO3 particulate composites with different volume fractions. The tests were performed in three-and four-point bending. The resonant technique was also used to analyse the influence of both volume fraction and temperature on Young's modulus. Significant decrease of ultimate strength, fracture toughness and Young's modulus was observed with the increase of the temperature. Ultimate strength decreases with the increase of particle volume fraction at room temperature. For the other temperatures, this decreasing trend is less clear. PVC/CaCO3 flexural Young's modulus calculated for a much lower loading segment increases with volume fraction. The same trend was obtained using the resonant technique. However, as the loading segment used to calculate the Young's modulus was increased a significant decrease of Young's modulus was obtained as a result of a progressive debonding at the particle-matrix interface. A 2D simplified FE simulation also confirms such trend. The dependence of Young's modulus relatively to the loading segment increases as the volume fraction is increased, leading to composite Young's modulus below matrix value for higher volume fractions and higher loading segments. Fracture toughness decreases with volume fraction.

• 出版日期2011-6