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Simply Supported Beam VS Cantilever Impact Tester

Abstract: 这篇文章主要比较了简支梁冲击试验机和悬臂梁冲击试验机的差异。简支梁冲击试验机按照ISO标准，适用于水平放置、两端不固定的试样，通过摆锤冲击来测量材料的吸能能力；而悬臂梁冲击试验机按照ASTM标准，适用于垂直冲击、一端固定的试样，特别适用于有缺口的试样检测。从试样规格来看，简支梁试样为80×10mm（可带缺口），悬臂梁试样为64×12.7×3.2mm（缺口深度10.2mm）。两者的试验方法和计算公式有所不同，简支梁机以冲击能量除以缺口面积表示韧性，悬臂梁机则以冲击能量除以试样厚度进行评估。简支梁机适用于多种材料的韧性和吸能能力测试，而悬臂梁机更适合针对有缺口试样的快速检验。

Charpy impact testing machines and cantilever beam impact testing machines are two commonly used equipment to evaluate the impact resistance of materials. There are obvious differences between them in terms of test standards, test methods, scope of application and sample specifications. 

Cantilever impact testing machine

In terms of test standards

Charpy impact testing machine follows ISO 179, GB/T 1043 and other standards; The cantilever beam impact testing machine is in accordance with ISO 180, ASTM D256, GB/T 1843 and other standards. 

In terms of test methods

In the Charpy test, the specimen is placed horizontally, the two ends are not fixed, and the pendulum impacts the specimen from the middle; In the cantilever test, one end of the specimen is fixed, the other end is free, and the pendulum is impinged from the free end.

Scope of application

Charpy impact testing machine is suitable for measuring the energy absorption capacity of materials under impact load, and is widely used in the toughness evaluation of various materials; The cantilever beam impact testing machine is mainly used to evaluate the impact resistance of notched specimens, and is often used for quality inspection of plastics, rubber and other materials. In terms of specimen specifications, the specimen specifications of Charpy beams are generally 80×10mm, which can be notched or notched; Cantilever specimens are typically 64×12.7×3.2 mm and notched depths of 10.2 mm.

Charpy impact testing machine


Compare itemsCharpy impact testing machineCantilever impact testing machine
Test criteriaISO 179、GB/T 1043、GB/T 2612、JB/T 8762、GB 4742ISO 180、ASTM D256、GB/T 1843、GB/T 2611、JB/T 8761
Impact Strength Test RangeMeasuring the resistance of a material to a pendulum impact is a single-point test. Impact energy is defined as the energy absorbed by a specimen when it is damaged under an impact load and is used to evaluate the toughness of a material.Determination of the impact resistance of materials under pendulum impact, especially notched specimens. Impact strength is defined as the amount of energy absorbed by a material from initial failure to complete failure and is used for rapid quality inspection and material toughness comparisons.
Test MethodThe specimen is placed horizontally and the ends are not fixed. Release the pendulum to impact the specimen and, if not, replace the heavier pendulum until the specimen is broken.The specimen is positioned vertically and clamped with the notched side facing the edge of the pendulum. Release the pendulum to impact the specimen and, if not, replace the heavier pendulum until the specimen is broken. Tests can be performed at low temperatures.
Test sampling specificationsThe specimen size is 80×10 mm and can be notched or notched.ASTM standard: specimen specification is 64×12.7×3.2 mm (2.5×0.5×0.125 in) with a common thickness of 3.2 mm and an optimal thickness of 6.4 mm. The notch depth is 10.2 mm (0.4 in). ISO standard: Type 1A multi-purpose specimen with shaved ends in 80×10×4 mm and a notch depth of 8 mm.
Test dataThe unit of impact energy is joules (J). Impact strength is the ratio of impact energy to the cross-sectional area at the notch. The higher the value, the better the toughness of the material.ASTM Standard: Impact energy is measured in J/m or ft-lb/in, and impact strength is the impact energy divided by the specimen thickness, and the result is the average of 5 specimens. ISO standard: The unit of impact energy is kJ/m², and the impact strength is the ratio of impact energy to the area under the notch, and the result is the average of 10 specimens. The higher the value, the better the toughness of the material.
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