Abstract
In this paper we have created some composites reinforced with corn cob powder and the matrix was made by a combination between Resoltech 1050 resin with its Resoltech 1058 hardener. For the composites manufacturing, we have used the manual casting technique. For the new manufactured composites, we have determined the mechanical properties from the tensile test according to ASTM D3039: Young modulus, breaking strength and elongation at break. We have also molded samples for the compression test according to ASTM D695-15 and we have determined the breaking strength. The tensile and compression tests were made on universal testing machines. In the end, we have determined also the dynamic mechanical properties for the studied material by clamping the samples at one edge and leaving the samples unconstrained at the other edge. At the unconstrained edge we have placed a Bruel&Kjaer accelerometer which recorded the samples free vibrations. From the free vibrations recording and Euler-Bernoulli theory, we have determined the next dynamic mechanical properties: damping factor per unit mass and length, eigenfrequency, dynamic modulus of elasticity, loss factor and dynamic rigidity. From the experimental results, we have obtained increased breaking strength values for the proposed material at compression compared to the tensile test. Compared to similar materials studied in the engineering literature, we have obtained increased compression breaking strength.
Highlights
The corn cob is a solution to reinforce composite materials [1,2,3,4]
We can see that our proposed composite has different behaviour at compression compared to the tensile test, with increased mechanical properties at compression
If we make a comparison between the moduli of elasticity, we can see that the dynamic one is 3.13 times higher and the difference between their values is 68%. This result is normal for composite materials because these are an-isotropic and non-homogenous
Summary
The corn cob is a solution to reinforce composite materials [1,2,3,4]. MPa for the breakıng stress and 650..900 for the modulus of elasticity. Values between 27 and 37 MPa for the breakıng stress and between 3200 up to 4600 for the modulus of elasticity were obtained. Lignosulfonates or sulfonated lignin are water-soluble polyelectrolytic polymers which are obtained from lignin, a polymer from phenylopropane units. They are by-products of the wood pulp production using sulphite pulp [5]. In [6], some composites with lignosulphonate matrix and corn cob powder were built. There were obtained maximum values for the compression breaking strength of 20 MPa and 320 MPa for the Young modulus
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