Flexural strength

The articles flexural strength and flexural tensile strength thematically overlap. Help me to better differentiate or merge the articles (→  instructions ) . To do this, take part in the relevant redundancy discussion . Please remove this module only after the redundancy has been completely processed and do not forget to include the relevant entry on the redundancy discussion page{{ Done | 1 = ~~~~}}to mark.  -  Johannes Kalliauer - Discussion | Posts 5:31 PM, Nov 20, 2016 (CET)

The bending tensile strength or defined parameter describes the maximum tensile stress that a body or material can absorb when subjected to bending (possibly in combination with a normal force ). It is a strength and thus has the unit of a voltage , e.g. B. N / mm². ${\displaystyle \beta _{BZ}}$ ${\displaystyle f_{cb}}$

If the flexural stress applied in a fiber is greater than the flexural tensile strength, the fiber cannot absorb the stress and fails. This can lead to structural failure of a structure .

The flexural strength can differ from the pure tensile strength because

1. the (fictitious) tensile stress in bending theory is often determined with the help of the linear elasticity theory , but this does not actually occur (e.g. with wood ),
2. At the imperfections , the load is transferred to fibers that have not yet reached the load of full strength.

The flexural strength can be determined in the laboratory using a 3 or 4 point flexural tensile test . The flexural tensile strength of the concrete can be determined experimentally according to DIN  1048, Volume 5 ( test method on test specimens ) on a beam that is subjected to the greatest bending moment by two equally large loads on the middle third of its span .

Sample values

See also : Flexural strength # example values

• Clay finishing plaster, containing fibers, has a flexural strength of, for example, 0.78 N / mm² with a compressive strength of 2.1 N / mm², adhesive strength of 0.30 N / mm² and a standardized abrasion of 0.6 g.
• Gypsum-bonded dry screed boards with added fibers in a thickness of 20 to 25 mm have a flexural strength of at least 4 N / mm².
• Cement- and synthetic resin-bound floor leveling compound has a flexural strength of 6.5 N / mm² with a compressive strength of 26 N / mm² and a bulk density of 1750 kg / m³.
• Galvanized sheet steel, 0.6 mm thick, typically has a flexural strength of over 200 N / mm²

See also

• Material testing
• Shear strength , breaking strength
• Tensile strength , splitting tensile strength , compressive strength
• Bending - a manufacturing process for plastic deformation of workpieces
• Bending stress , bending stiffness
• Bending of a straight beam - bending line and bending stresses
• Deflection - generally follows from a bend.

Individual evidence

1. ↑ DAfStb: Guideline on concrete construction when handling substances hazardous to water. October 2004.
2. ↑ Earth-moist earth-top plaster - 05.010.1 / 05.010.2 Earth plaster mortar DIN 18947 - LPM 04 f - S II - 1.8 , In: Conluto.de; accessed in August 2019
3. ↑ Fermacell Flooring Elements EE20 No. FC-0020 - Declaration of Performance ; accessed in August 2019
4. ↑ Planning and processing - fermacell floor systems , July 2019, p. 8; In: Fermacell.de