Effect of Specimen Diameter in Compression at High Strain Rates

Effect of strain rate and temperature on the mechanical behavior of magnesium nanocomposites

“…The specimen dimension for quasi-static compressive tests was processed according to ASTM standard E9-89a [25]. The effect of specimen size in SHPB tests was investigated by Rodriguez et al [26], Gorham [27]and Ahmad and Shu [28]. The dimension used in this research was based on their study and preliminary work done by the author [29].…”

Mechanical behaviour of AZ91D and AZ31B magnesium alloys at wide range of strain rates and temperatures

“…To see the tests were carried using dry ice and elevated temperature tests were by using coil heater. Compression specimens with length to diameter ratio of 0.5 to 0.6 and bar to specimen diameter ratio Db/Ds between 0.6 and 0.8 were found optimal [82] and used in the present study. For tensile specimen l/d ratio of 2.5 and higher is found appropriate for large strain tensile testing.…”

“…Havranek and Littlejohn [81] in investigating the size effect found that an increase in the specimen diameter tends to produce more barrelling and thus giving an overestimation of deformation stresses. High strain rates are obtained for smaller diameter specimens but at the cost of larger inaccuracies (oscillations) in stress-strain curves [82].…”

“…Optimum specimen geometries [82] for compression and tensile tests were chosen to minimize the size effects on the behaviour of material. The diameter and height of the cylindrical specimens used for high strain rate compression tests are 8.0 ± 0.10and 4.0 ± 0.05 respectively for both AZ91D and AZ31B alloys.…”