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EnglishThis 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. Key words: proportional deformity modulus; compressibility; mechanical properties portuguesNeste trabalho objetivou-se verificar a influencia do teor de agua nos valores da forca maxima de compressao, modulo proporcional de deformidade, coeficientes elasticos d, e, f, alem dos valores da tangente e secante maximas nos graos de crambe (Crambe abyssinica Hochst), submetidos a compressao na posicao natural de repouso. Os graos de crambe, utilizados com teores de agua entre 0,1547 e 0,0482 (decimal b.s.), foram secos nas temperaturas de 40°C e comprimidos uniaxialmente entre duas placas paralelas, na posicao natural de repouso, cuja reducao do teor de agua ao longo da secagem foi acompanhada pelo metodo gravimetrico (perda de massa). A forca de compressao necessaria para deformar os graos de crambe diminui com o aumento do teor de agua. O modulo proporcional de deformidade aumenta com a reducao da deformacao, obtendo-se valores entre 0,09 e 0,27 (x 102MPa), em que o modelo sigmoidal, descrito por meio da serie de Taylor, representa adequadamente a resistencia dos graos de crambe a compressao na posicao natural de repouso, para os teores de agua menores que 0,0813 (b.s.) Palavras-chave: modulo proporcional de deformidade; compressao; propriedades mecânicas

Moisture content on the mechanical behavior of crambe grains