Abstract
Bruise due to compression and impact load are the most common types of defects of guava. In order to reduce bruise damage, it is necessary to know the mechanical response of guava under mechanical loads. In this study, the bruise of guava was investigated by instrumented mechanical tests. The quasi-static compression tests were performed by using a custom-made texture profile analyzer. A load cell was attached to the cross head to measure the force and CCD camera was used to measure the compressive displacement of guava under tests. The motion control of cross head and the measurement of load cell were done by using an embedded controller. Drop impact tests were performed by using instrumented drop heads. A uniaxial accelerometer was installed on the drop head to monitor the acceleration of drop head during the impact. The assembly of accelerometer and drop impact head was assumed to be rigid and the impact force was computed by using Newton’s second law. The relations between mechanical force and size of damage bruise were investigated. In this study, hyperspectral images obtained from the guavas subjected to compression and impact loads were used to identify the area of bruise due to mechanical loads.
