TY - JOUR
T1 - Off-axis flexure test
T2 - A new method for obtaining in-plane shear properties
AU - Mujika, F.
AU - Valea, A.
AU - Gañán, P.
AU - Mondragon, I.
PY - 2005
Y1 - 2005
N2 - Off-axis three-point flexure test for unidirectional composites is proposed as a new method for obtaining in-plane shear modulus and in-plane shear strength. The method of determination of the in-plane shear modulus G LT has been explained in a previous work where the displacement field of an off-axis flexure test was analyzed. In the present work, besides summarizing the calculation equations of GLT, the condition of small displacements is analyzed. Otherwise, an error analysis is carried out in order to study the influence of the calculated value of GLT on the other elastic parameters. Normal and shear stresses in the fiber-matrix interface change from point to point in the specimen depending on the fiber orientation angle and specimen geometry. A critical point of failure that depends on the fiber orientation angle is determined and optimum conditions for obtaining in-plane shear strength are discussed. Experiments for different fiber orientations and geometric conditions have been carried out for IM7/8552 epoxy matrix based carbon fiber reinforced unidirectional composite material.
AB - Off-axis three-point flexure test for unidirectional composites is proposed as a new method for obtaining in-plane shear modulus and in-plane shear strength. The method of determination of the in-plane shear modulus G LT has been explained in a previous work where the displacement field of an off-axis flexure test was analyzed. In the present work, besides summarizing the calculation equations of GLT, the condition of small displacements is analyzed. Otherwise, an error analysis is carried out in order to study the influence of the calculated value of GLT on the other elastic parameters. Normal and shear stresses in the fiber-matrix interface change from point to point in the specimen depending on the fiber orientation angle and specimen geometry. A critical point of failure that depends on the fiber orientation angle is determined and optimum conditions for obtaining in-plane shear strength are discussed. Experiments for different fiber orientations and geometric conditions have been carried out for IM7/8552 epoxy matrix based carbon fiber reinforced unidirectional composite material.
KW - In-plane shear modulus
KW - In-plane shear strength
KW - Off-axis flexure
KW - Unidirectional composite
UR - http://www.scopus.com/inward/record.url?scp=20444428015&partnerID=8YFLogxK
U2 - 10.1177/0021998305048735
DO - 10.1177/0021998305048735
M3 - Artículo en revista científica indexada
AN - SCOPUS:20444428015
SN - 0021-9983
VL - 39
SP - 953
EP - 980
JO - Journal of Composite Materials
JF - Journal of Composite Materials
IS - 11
ER -