关键词: 直条型通心面, 压杆后屈曲, 形变行为, 弯曲折断, 力学质地

Abstract: In order to clarify the bending deformation law of straight thread-like pastas, their mechanical texture parameters including bending-resistant capability and elastic modulus was explored and compared with Chinese dry noodles. Midpoint deflection and bending angle in different end axial displacements of straight thread-like pastas from different brands were measured using a scanner. Their mechanical texture parameters were tested using a texture analyzer. The results showed that the deformation behavior of straight thread-like pastas as analyzed based on the large deflection theory of compressive rod post-buckling was accurate, practicable and reliable. The optimal experimental conditions for testing elastic modulus were determined as 180 mm of sample length and 20° of end bending angle. Under these conditions, the elastic modulus of straight thread-like pastas was measured to be approximately 4.1 × 109 N/m2, an increase of 1.1 × 109 N/m2 compared with Chinese dry noodles. The bending stress at breaking points of straight thread-like pastas was approximately 36.0 N/mm2, an increase of approximately 22.3 N/mm2 compared with Chinese dry noodles. This parameter could be used for the evaluation of bending resistance with low errors.

Key words: straight thread-like pasta, compressive rod post-buckling, deformation behavior, bending fracture, mechanical texture