Bending stress, specific shearing energy, and Young's modulus of canola (Brassica napus L.) stems were investigated. The specific shearing energy using pendulum method and bending force were measured for four moisture content levels (35%, 43%, 50%, and 57%, w.b.), three varieties (Zarfam, Opera, and Okapi), and three nitrogen fertilizer levels (250, 400, and 550 kg ha-1). The results of data analysis showed that the specific shearing energy increases and, bending stress and Young's modulus of canola stems decreased as the moisture content increased. The maximum value of the specific shearing energy was 3.94 MJ mm-2 for the Opera stems, while Zarfam with 3.27 MJ mm-2 had the minimum. The maximum value of the bending stress was 48.1 MPa for the Opera stems while Zarfam with 44.83 MPa had the minimum. The average of Young's modulus was found to be 3.80, 4.15, and 3.84 GPa for Zarfam, Okapi, and Opera varieties, respectively. The specific shearing energy decreased as the amount of nitrogen fertilizer increased. The maximum and minimum values of bending stress occurred with 400 and 550 kg ha-1 levels of nitrogen fertilizer, respectively.
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Esehaghbeygi et al. (2009) studied this question.
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