tag:blogger.com,1999:blog-5822805028291837738.post3734660198516128925..comments2021-02-25T02:11:35.499-05:00Comments on Various Consequences: Octet Truss for Topology OptimizationJoshua Stultshttp://www.blogger.com/profile/03506970399027046387noreply@blogger.comBlogger3125tag:blogger.com,1999:blog-5822805028291837738.post-64417737523481692372013-01-22T08:22:52.392-05:002013-01-22T08:22:52.392-05:00Abstract: Matrix methods of linear algebra are use...Abstract: <i>Matrix methods of linear algebra are used to analyse the structural mechanics of the periodic pinjointed truss by application of Bloch’s theorem. Periodic collapse mechanisms and periodic states of self-stress are deduced from the four fundamental subspaces of the kinematic and equilibrium matrix for the periodic structure. The methodology developed is then applied to the Kagome lattice and the triangular–triangular (T–T) lattice. Both periodic collapse mechanisms and collapse mechanisms associated with uniform macroscopic straining are determined. It is found that the T–T lattice possesses only macroscopic strain-producing mechanisms, while the Kagome lattice possesses only periodic mechanisms which do not generate macroscopic strain. Consequently, the Kagome lattice can support all macroscopic stress states. The macroscopic stiffness of the Kagome and T–T trusses is obtained from energy considerations. The paper concludes with a classification of collapse mechanisms for periodic lattices.</i><br /><a href="http://www-mech.eng.cam.ac.uk/profiles/fleck/papers/213.pdf" rel="nofollow">The Structural Performance of the Periodic Truss</a>Joshua Stultshttps://www.blogger.com/profile/03506970399027046387noreply@blogger.comtag:blogger.com,1999:blog-5822805028291837738.post-26709537018997669052013-01-22T08:08:50.087-05:002013-01-22T08:08:50.087-05:00244GB of RAM, dual processor large memory instance...244GB of RAM, dual processor large memory instances, $3.50 per hour for Linux instances: <a href="http://aws.typepad.com/aws/2013/01/ec2-for-in-memory-computing-the-high-memory-cluster-eight-extra-large.html" rel="nofollow">EC2 for In-Memory Computing - The High Memory Cluster Eight Extra Large Instance</a>Joshua Stultshttps://www.blogger.com/profile/03506970399027046387noreply@blogger.comtag:blogger.com,1999:blog-5822805028291837738.post-43177022114713799342013-01-04T09:12:57.086-05:002013-01-04T09:12:57.086-05:00Here's a paper that analyzes the effective mac...Here's a paper that analyzes the effective macroscopic properties (strenght / density variation) as a function of the octet truss unit cell's member length and radius: <a href="http://www-mech.eng.cam.ac.uk/profiles/vsd/papers/jmps_octet.pdf" rel="nofollow">Effective properties of the octet-truss lattice material</a><br /><br /><b>Abstract.</b> <i>The effective mechanical properties of the octet-truss lattice structured material have been investigated both experimentally and theoretically. Analytical and FE calculations of the elastic properties and plastic yielding collapse surfaces are reported. The intervention of elastic buckling of the struts is also analysed in an approximate manner. Good agreement is found between the predictions of the strength and experimental observations from tests on the octet-truss material made from a casting aluminium alloy. Moreover, the strength and stiffness of the octet-truss material are stretching-dominated and compare favourably with the corresponding properties of metallic foams. Thus, the octet-truss lattice material can be considered as a promising alternative to metallic foams in lightweight structures.</i>Joshua Stultshttps://www.blogger.com/profile/03506970399027046387noreply@blogger.com