Abstract
A low density composite (Shirasu Balloons Aluminum Composites: SBAC) of volcano glass micro-balloons (Shirasu Balloons: SB) and an aluminum alloy (Al-12%Si) was investigated in terms of tensile strength. SBAC fractures abruptly at a critical tensile stress, that is a typical brittle material. The fractured surface propagates through the equatorial section of SB and the constricted parts of matrix metal where SB is in contact with together. The effective area fractions of metal and SB wall (SG) sections in the fractured surface are respectively AM=0.363-0.282 VSB and ASG=(1.28+0.556 VSB) h/R, where h and R are the wall thickness and the mean radius of SB, and VSB is the volume fraction of SB in SBAC. The tensile strength of SBAC is proportional to the summation of AM and ASG since SB wall has Young's modulus nearly equal to that of the aluminum alloy. The sphericity of SB changes the stress concentration around the cavitation in SB and affects the tensile strength of SBAC.
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