{"id":17961,"date":"2023-11-15T12:30:09","date_gmt":"2023-11-15T11:30:09","guid":{"rendered":"https:\/\/dopak.pl\/what-is-impact-strength-and-how-to-control-it-in-the-injection-molding-process\/"},"modified":"2023-11-30T11:15:54","modified_gmt":"2023-11-30T10:15:54","slug":"what-is-impact-strength-and-how-to-control-it-in-the-injection-molding-process","status":"publish","type":"post","link":"https:\/\/dopak.pl\/en\/what-is-impact-strength-and-how-to-control-it-in-the-injection-molding-process\/","title":{"rendered":"What is impact strength and how to control it in the injection molding process?"},"content":{"rendered":"

Impact strength is one of the key parameters in plastics processing<\/a> . It is particularly important in the context of the functional properties of the finished product<\/strong> . The durability of everyday items, but not only that, depends on impact resistance.<\/strong> The impact parameter is also an important feature in materials engineering and construction, especially in the case of materials used to produce, for example, safety elements such as helmets or protectors. Our safety then depends on the impact strength. In the article we answer the question: what does impact strength depend on and how can it be controlled?<\/p>\n

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What is impact strength?<\/h2>\n

Impact strength<\/strong> , according to the simplest definition, is the material’s resistance to fracture under dynamic load<\/strong> . This parameter is expressed in joules<\/strong> and determines the work necessary to fracture the sample in relation to its cross-sectional area. Impact strength is an important parameter determining the strength of polymeric materials<\/strong> due to their application. Plastics are often used in conditions where dynamic loads, vibrations or sudden load changes occur.<\/p>\n

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How to assess impact strength?<\/h2>\n

There are several standardized test methods for assessing the resistance<\/strong> of polymers to impact loading:<\/p>\n

1. Charpy test<\/strong>:<\/h3>\n

This is one of the more common methods for assessing impact strength. In the Charpy test, a cuboid-shaped sample with or without a notch (“V” notch) is struck with a hammer using a specified energy. It measures how much energy is absorbed by the sample before it breaks<\/strong> . The result of the Charpy test is the impact strength of the sample, expressed in joules.<\/p>\n

2. Izod test<\/strong><\/h3>\n

Similar to the Charpy test. The method differs in the way the sample is mounted, and the sample is always notched. In the Izod test, the sample is also struck at a specific energy and the result is expressed in joules. This method is often used to test impact strength at low temperatures<\/strong> .<\/p>\n

3. Gardner test<\/strong><\/h3>\n

This is a modification of the Charpy test in which the sample is torn longitudinally. The sample is usually rod-shaped. The Gardner test measures the longitudinal impact strength of a material<\/strong> , and the result is expressed in joules.<\/p>\n

4. Dart Drop Test<\/strong><\/h3>\n

In this method, a special tip of known mass is dropped from a specific height and hits the workpiece sample. The energy required to cause the sample to penetrate is measured. This method is particularly useful for testing polymer films and plates<\/strong> .<\/p>\n

The selection of the appropriate impact testing method depends on the specific application requirements and the conditions in which the material will be used. Impact tests allow you to assess whether a given polymer material will be able to withstand dynamic loads, which is crucial in designing products that are exposed to them.<\/p>\n

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What does impact strength depend on and how can it be controlled?<\/h2>\n

Impact strength depends on:<\/h3>\n