基于压杆后屈曲的直条型通心面力学质地  

Analysis of Mechanical Texture of Straight Thread-Like Pasta Based on Compressive Rod Post-Buckling

作　　者：姜松[1] 朱美如[1] 曾昕鑫[1] 刘锦伟[1] 赵杰文[1] 

机构地区：[1]江苏大学食品与生物工程学院,江苏镇江212013

出　　处：《食品科学》2012年第23期83-87,共5页Food Science

基　　金：江苏省高校自然科学研究重大项目(11KJA550002)

摘　　要：为了阐明直条型通心面弯曲折断的形变规律,探讨其力学质地(弹性模量和抗弯能力),并与中国挂面进行比较。利用扫描仪对不同品牌通心面进行端部轴向位移量的中点挠度和端部转角两个形变参数的测定;利用物性仪对其力学质地进行测定。结果表明:用压杆后屈曲理论分析直条型通心面弯曲形变行为是准确、可行和可靠的;其弹性模量最佳测试条件为试样长度180mm、端部转角20°,测定值在4.1×109N/m2左右,比中国挂面高1.1×109N/m2左右;采用断裂点弯曲应力评价直条型通心面的抗弯能力误差较小,其断裂点弯曲应力在36.0N/mm2左右,比中国挂面高22.3N/mm2左右。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 × 109N/m2,an increase of 1.1 × 109N/m2compared 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/mm2compared with Chinese dry noodles.This parameter could be used for the evaluation of bending resistance with low errors.

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 

分 类 号：TS213.2[轻工技术与工程—粮食、油脂及植物蛋白工程] TS201.7[轻工技术与工程—食品科学与工程]