By Jacob Fish, Ted Belytschko

ISBN-10: 0470035803

ISBN-13: 9780470035801

This can be a nice e-book for introductory finite components. all of the uncomplicated and primary stuff is there. Too undesirable, although, that it really is a nearly notice for observe reproduction of the ebook through Ottosen and Petersson (1992!). And, as is usually the case, the unique is simply that little bit larger - so minus one celebrity.

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Additional resources for A First Course in Finite Elements

Example text

As the nodal displacements are assumed to be small, the effect of the normal displacements on the elongation is therefore of second order, and hence the effects of these displacement components on the stress and strain can be neglected. 11) embedded in a matrix of zeros. In other words, we have simply scattered the axial bar stiffness into a larger matrix; this is valid when the element coordinate system is aligned with the axis of the element. 12 at the nodes (I ¼ 1; 2) is obtained by means of the relation for vector transformations: e e e e u0e Ix ¼ uIx cos  þ uIy sin  e e e e u0e Iy ¼ ÀuIx sin  þ uIy cos  These equations can be written in the matrix form as follows: e d 0 ¼ Re d e ; ð2:43Þ where 2 3 ue1x 6 ue 7 6 1y 7 d e ¼ 6 e 7; 4 u2x 5 ue2y 2 cos e 6 À sin e 6 Re ¼ 6 4 0 0 sin e cos e 0 0 0 0 cos e À sin e 3 0 0 7 7 7: sin e 5 cos e Re is the rotation matrix.

This is an example of a problem in linear stress analysis or linear elasticity, where we seek to find the stress distribution sðxÞ in the bar. The stress will results from the deformation of the body, which is characterized by the displacements of points in the body, uðxÞ. The displacement results in a strain denoted by eðxÞ; strain is a dimensionless variable. 2, the bar is subjected to a body force or distributed loading bðxÞ. The body force could be due to gravity (if the bar were placed vertically instead of horizontally as shown), a magnetic force or a thermal stress; in the one-dimensional case, we will consider body force per unit length, so the units of bðxÞ are force/length.

17 is: k¼ 5Etab ; ða þ bÞl where E is the Young’s modulus and t is the width of the bar (Hint: subdivide the bar with a square hole into 3 elements). 2. 18. Nodes A and B are fixed. A force equal to 10 N acts in the positive x-direction at node C. Coordinates of joints are given in meters. Young’s modulus is E ¼ 1011 Pa and the cross-sectional area for all bars are A ¼ 2 Á 10À2 m2 . a. b. c. d. Number the elements and nodes. Assemble the global stiffness and force matrix. Partition the system and solve for the nodal displacements.

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A First Course in Finite Elements by Jacob Fish, Ted Belytschko


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