Corner stiffness

Corner stiffness (or corner stiff connection) is a term used for corner-shaped connections of rods or rod-shaped components in mechanical engineering , with which the bending stiffness of the composite, which depends on the design of a corner , is described.

Because the bending load is often maximal in the corner or near the corner, its design is of particular importance. Under these circumstances, the design of the neighboring areas is also affected, and the term corner stiffness is not closely related to the corner.

The more general term flexural rigidity describes a physical quantity to which a value can be assigned. In the case of a straight beam, it is the product with the modulus of elasticity of the beam material and the area moment of inertia at the point of the beam under consideration. The additional term corner stiffness can i. d. Usually only needed qualitatively, e.g. B. with the statement that by various constructive measures, after their implementation i. d. As a rule, the corner point has merged into a larger material system, is enlarged. ${\ displaystyle E \ cdot I}$ ${\ displaystyle E}$ ${\ displaystyle I}$

A kinked beam without stiffening measures at the corner can be treated approximately like two straight beams according to the rules of a model adaptation made in structural engineering , which is known under the working term rigid corner . For the strength and deformation calculation of large-area, rigidly designed connections, more complex models are used, e.g. B. the finite element method .

Rectangular frame made of wood;
Timber connection designed as a simple joint in the corners using additional strips to make the corners more rigid.
Wooden roof truss ; Head straps for corner reinforcement of the connections between stand- crossbeam and stand- purlin .
Metallic structure of a shed ; Corner connection between stand and rafter stiffened by struts .
Car - rear axle ; wheel-bearing swing arm welded to crossbeam; wide beam end for corner reinforcement.
Concrete bench ; which already has higher corner stiffness due to manufacturing "in one piece"; further enlarged with small haunches (enlarged cross-section).

Individual evidence

↑ ^a ^b Wolfgang Matschinsky: Wheel guides of road vehicles: Kinematik, Elasto-Kinematik and construction , 3rd edition, Springer Verlag Berlin Heidelberg 2007, ISBN 978-3-540-71196-4 , section on twist beam axles
↑ H.Dubbel (eds.): Handbook for Mechanical Engineering . 1st edition. Springer, Berlin 1914, ISBN 978-3-642-64910-3 , doi : 10.1007 / 978-3-642-64925-7 ( books.google.ch ).

[mat-1] Wolfgang Matschinsky: Wheel guides of road vehicles: Kinematik, Elasto-Kinematik and construction , 3rd edition, Springer Verlag Berlin Heidelberg 2007, ISBN 978-3-540-71196-4 , section on twist beam axles

[2] H.Dubbel (eds.): Handbook for Mechanical Engineering . 1st edition. Springer, Berlin 1914, ISBN 978-3-642-64910-3 , doi : 10.1007 / 978-3-642-64925-7 ( books.google.ch ).