De Ketelaere Bart, Corion Matthias, Adriaens Ines, Van Liedekerke Paul, Saeys Wouter
Division of Mechatronics, Biostatistics and Sensors (MeBioS)-Department of Biosystems, Katholieke Universiteit Leuven, Kasteelpark Arenberg, 30, 3001 Leuven, Belgium.
Division Animal and Human Health Engineering (A2H)-Department of Biosystems, Katholieke Universiteit Leuven, Kleinhoefstraat 4, 2440 Geel, Belgium.
Foods. 2023 Mar 11;12(6):1189. doi: 10.3390/foods12061189.
In the egg industry, fast and highly reliable quality measurements are crucial. This study presents a novel method based on Hertz contact theory that allows for non-destructive determination of eggshell strength. The goal of the study was to evaluate the material strength (Young's Modulus) and structural strength (stiffness) of eggshells. To this end, an experimental setup was constructed to measure the collision of an eggshell with a small steel ball, which was recorded using a laser vibrometer. The study analyzed a sample of 120 eggs and found a correlation of 0.85 between the traditional static stiffness measured during quasi-static compression tests and the stiffness obtained from the Hertz contact theory. The results show that Hertz contact theory is valid for small steel spheres impacting eggshells, while a sensitivity analysis indicated that the most important factor in determining the strength of the eggshell is the contact duration between the egg and the impactor. These results open up the possibility of grading eggs based on their shell strength in a non-destructive manner.
在蛋类产业中，快速且高度可靠的质量检测至关重要。本研究提出了一种基于赫兹接触理论的新方法，该方法能够无损测定蛋壳强度。本研究的目的是评估蛋壳的材料强度（杨氏模量）和结构强度（刚度）。为此，构建了一个实验装置来测量蛋壳与小钢球的碰撞，并使用激光测振仪进行记录。该研究分析了120个鸡蛋样本，发现在准静态压缩试验中测得的传统静态刚度与从赫兹接触理论获得的刚度之间的相关性为0.85。结果表明，赫兹接触理论对于小钢球撞击蛋壳是有效的，而敏感性分析表明，决定蛋壳强度的最重要因素是鸡蛋与撞击器之间的接触持续时间。这些结果为以无损方式根据蛋壳强度对鸡蛋进行分级开辟了可能性。
