基于感压胶片测量技术的苹果静压接触应力及损伤分析  

Study on contact pressure and mechanical damage of apple under compression using pressure-sensitive film

作　　者：冯哲[1,2] 吴杰[1,2] 

机构地区：[1]石河子大学机械电气工程学院,新疆石河子832003 [2]教育部绿洲特色经济作物生产机械化工程研究中心,新疆石河子832003

出　　处：《食品与机械》2015年第5期186-189,共4页Food and Machinery

基　　金：国家自然科学基金资助项目(编号:31160335)

摘　　要：采用Prescale感压胶片测量苹果静压接触应力的分布特性,并结合图像处理技术对褐变区域进行精确测量,以明确应力面积与损伤面积之间的关系,了解苹果损伤发生的机制。结果表明,苹果果肉出现酶促褐变损伤的应力为0.29 MPa;0.20-0.40 MPa的应力分布占72%,构成苹果损伤的主要区域;苹果的损伤面积与应力均值无直接关系;应力总面积高出苹果损伤面积9%,只有≥0.10MPa应力面积最接近苹果损伤面积,用其估测损伤面积的平均误差仅为1.66%,两者之间的关系可表示为A=0.98AP≥0.10＋1.95。In order to accurately predict the bruise area of apple subjected to compressive loading,the pressure distribution characteristics for apple compressed at different loads was investigated by the pressure-sensitive film technique combined with apple bruise measurements.Furthermore,the relationship between contact pressure area and bruise area was investigated and the range of pressure area that closed to the bruise area was determined.The result showed that the value of apple flesh failure stress was 0.29 MPa.Pressure distribution on the pressure-sensitive film showed that pressure of0.20~0.40 MPa accounted for 72% of the total pressure area and taken the major proportion of apple bruise area.The average pressure had little influence on the apple bruise.The measured pressure area was up to 9% higher than the actual bruise area.Only the area occupied by the pressure over than 0.10 MPa was much close to the bruise area with 1.66% relative error rate.The linear regression equation between bruise area and pressure area（A=0.98AP≥0.10＋1.95）could precise estimate the bruise area of apple under static load.

关 键 词：苹果 静压 损伤面积 感压胶片 接触应力 

分 类 号：TS255.7[轻工技术与工程—农产品加工及贮藏工程]