In this research, mechanical aspects of whole safflower seed was measured in terms of seed rupture force, deformation, modulus of elasticity and rupture energy. Safflower seeds were quasi-statically loaded in vertical orientation with moisture contents in four levels: 4%, 8%, 14% and 20%; seed size in three levels: small, medium, and large; and two varieties: Golshid and Afshan. The results showed that the force required for initiating seed rupture decreased from 38.5 to 42.9 N and 36.87 to 40.8 N, while the rupture energy at seed rupture increased from 197.13 to 259.14 Jm-3 and 264.87 to 322.06 Jm-3 and seed deformation increased from 1.03 to 1.48 mm and 1.15 to 1.52 mm with increase in moisture content from 4% to 20% d.b., for Golshid and Afshan, respectively. The average modulus of elasticity of safflower seed from 106.13 to 90.35 Mpa and 77.85 to 65.90 Mpa were obtained for moisture levels ranging from 4 to 20%, for Golshid and Afshan varieties, respectively. Investigating effect of size revealed that all studied mechanical aspects of safflower seed increased as size of the seed increased from

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