Hypothesis to Explain the Size Effect Observed in APO-BMI Compression Tests

Schembri, Philip Edward¹  Siranosian, Antranik Antonio¹  Kingston, Lance Allen¹ 

[1] Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

关键词: syntactic foam;    damage;    stiffness;    modulus;   

DOI  :  10.2172/1167240
RP-ID  :  LA-UR--15-20076
PID  :  OSTI ID: 1167240

学科分类：材料科学（综合）

美国|英语

来源: SciTech Connect

【 摘 要 】

In 2013 compression tests were performed on cylindrical specimens of carbon-microballoon-APOBMI syntactic foam machined to different lengths (0.25, 0.5, and 2.8 inches1) (Kingston, 2013). In 2014 similar tests were performed on glass-microballoon-APO-BMI of different lengths (~0.15???, ~0.32???, and ~0.57???). In all these tests it was observed that, when strains were calculated from the platen displacement (corrected for machine compliance), the apparent Young???s modulus of the material decreased with specimen size, as shown in Table 1. The reason for this size effect was speculated to be a layer of damage on or near the top and bottom machined surfaces of the specimens (Kingston, Schembri, & Siranosian, 2014). This report examines that hypothesis in further detail.