However, to omit reinforcement at the point of contraflexure entirely is inadvisable as the actual location is unlikely to realistically be defined with confidence. Requirements for accurate bend-testing of four-point and three-point beams of rectangular cross-section are outlined. Knowing the place of the contraflexure is especially useful when designing reinforced concrete or structural steel beams and also for designing bridges.įlexural reinforcement may be reduced at this point. where the bending moment reverses direction along the beam). In other words it is the point of zero moment. Note that flexural offset yield strength may be a different value than the flexural strength. Answer (1 of 7): Point of contra flexure is the point on a beam where the value of bending moment changes it sign ie positive to negative or vice versa. Flexural offset yield strength The stress at which the stress-strain curve deviates by a given strain (offset) from the tangent to the initial straight line portion of the curve. In a bending moment diagram, it is the point at which the bending moment curve intersects with the zero line (i.e. Flexural strength measurements are expressed in force per unit area. In solid mechanics, a point along a beam under a lateral load is known as a point of contraflexure if the bending moment about the point equals zero.
JSTOR ( March 2019) ( Learn how and when to remove this template message).A three point bend test consists of the sample placed. Unsourced material may be challenged and removed. The two most common types of flexure test are three point and four point flexure bending tests. Please help improve this article by adding citations to reliable sources. This article needs additional citations for verification.
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