Abstract
ABSTRACT: This study aimed to verify the influence of moisture content on the values of maximum compressive strength, proportional deformity modulus, elastic coefficients d, e, and f beyond the tangent values, and maximum grain drying of crambe (Crambe abyssinica Hochst) under compression in natural resting position. Crambe grains with moisture contents ranging from 0.1547 to 0.0482 decimal db were dried at 40°C and uniaxially compressed between two parallel plates in the natural rest position. The gravimetric method was used to monitor reduction in moisture content during drying (weight loss). It was concluded that the compression force required to deform the crambe grains decreases as the moisture content increases. The proportional deformity modulus increases as the deformation decreases, yielding values between (0.09-0.27)×102MPa. Sigmoidal model described by Taylor series adequately represents the compression resistance of crambe grains in the natural rest position with moisture content lower than 0.0813db.
Highlights
Crambe (Crambe abyssinica Hochst) is a plant that belongs to the family Brassicaceae
Was only satisfied when the moisture contents was below 0.1012 decimal db, whereas the parameter d exhibited a positive sign for all tested levels of moisture contents
The maximum tangent values for moisture content levels of 0.0813, 0.0580, and 0.0482 decimal db were higher than the maximum secant values, confirming the findings obtained by several studies that assessed the mechanical properties of similar agricultural products, such as HENRY et al (2000) and RIBEIRO et al (2007)
Summary
Crambe (Crambe abyssinica Hochst) is a plant that belongs to the family Brassicaceae. The mechanical damage shows a cumulative effect, which increases their impact, i.e., as the damage impact accumulates, the damaged grains and seeds become increasingly sensitive to further damage (PAIVA et al, 2000). In this regard, numerous studies have been conducted to identify the mechanical properties of several agricultural products with different moisture contents. Numerous studies have been conducted to identify the mechanical properties of several agricultural products with different moisture contents Some of these products are coffee fruit (COUTO et al, 2002; BATISTA et al, 2003), soybean (RIBEIRO et al, 2007), pistachio (GALEDAR et al, 2009), rice (RESENDE et al, 2013), and wheat (FERNANDES et al, 2014)
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