MatWeb - Material Property Data 用 MatWeb 登广告!    Register Now
越过59,000 以上, 金属、塑料、陶瓷和合成物的数据资料库。
MatWeb - Material Property Data 主页  •  搜寻  •  工具  •  供应商  •  文件夹  •  有关我们  •  常用问题  •  登录   •  English English English 
  搜寻方法:  高级先进 | 材料类型 | 特性 | 构成份  | 商标  | 制造商

Flexural Strength Testing of Plastics

The flexural strength of a material is defined as its ability to resist deformation under load. For materials that deform significantly but do not break, the load at yield, typically measured at 5% deformation/strain of the outer surface, is reported as the flexural strength or flexural yield strength. The test beam is under compressive stress at the concave surface and tensile stress at the convex surface. The figure below, from Quadrant Engineering Plastic Products, shows the test geometry for ASTM D790.

flexural strength testing apparatus ASTM D790:
Specimen of 1/8" x 1/2" x 5" is placed on two supports and a load is applied at the center. The load at yield is the sample material's flexural strength.

The analogous test to measure flexural strength in the ISO system is ISO 178. The values reported in the ASTM D790 and ISO 178 tests seldom differ significantly. These tests also give the procedure to measure a material's flexural modulus (the ratio of stress to strain in flexural deformation).

The table below lists average flexural strengths and flexural moduli values for some filled and unfilled polymers. These values are a measure of stiffness; flexible materials such as film grade polymers used have lower values than fiber reinforced engineering polymers used as metal substitutes such as polyimides or acetals.


Typical Flexural Strength and Flexural Modulus of Polymers

Polymer Type Flexural Strength (MPa) Flexural Modulus (GPa)
ABS 75 2.5
ABS + 30% Glass Fiber 120 7
Acetal Copolymer 85 2.5
Acetal Copolymer + 30% Glass Fiber 150 7.5
Acrylic 100 3
Nylon 6 85 2.3
Polyamide-Imide 175 5
Polycarbonate 90 2.3
Polyethylene, MDPE 40 0.7
Polyethylene Terephthalate (PET) 80 1
Polyimide 140 3
Polyimide + Glass Fiber 270 12
Polypropylene 40 1.5
Polystyrene 70 2.5
<meta http-equiv=Content-Type content="text/html; charset=UTF-8">
请读关于材料数据的使用许可协议和我们的隐私权。询问或评论有关 MatWeb? 请与 联系。我们感谢您对 MatWeb的参与。

本站点由 Automation Creations, Inc. 设计和维护。这个网站的内容, MatWeb 的商标,与 "MatWeb" 由 Automation Creations, Inc.版权1996-2006拥有 。 MatWeb 意欲为个人使用 , 非商业用途。这个站点的内容、结果和技术数据,未经由 Automation Creations, Inc. 允许, 不可以被电子,摄影或实质上地再生产或自动化创作。