Bending strength.pptx
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Bending strength, also called flexural strength, is the ability of a material to resist bending forces. It is measured in megapascals (MPa) using a three-point or four-point bending test where a material is supported at two points and a load is applied at the center or additional points. The bending strength can be calculated using an equation that considers the length, breadth, and distance of the material. This property must be considered when designing medical equipment as the selected material must have appropriate bending strength for the application, such as bone implants, dental implants, cardiovascular valves, and surgical instruments.
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Bending strength.pptx
- 1. Bending strength Bashar Shareef Ahmed Wael Hussein Hashim
- 2. Bending strength • Bending strength or flexural strength, is the ability of a material to resist a force which tries to bend the material. Denoted by sigma, and measured by Mpa.
- 3. How-to-measure • It’s often measured using a three-point or four-point bending test. • In a three-point bending test. The material is applied to one axial load at it’s center, and supported at 2 points. • The four-point test contains the same concept, except the load are applied at 2 additional points, to create a more uniform stress distribution.
- 4. Mathematical approach • It can be measured easily by the following equation: • where: • L: length of material • b:breadth of material • d: distance
- 5. Designing considerations • This material-property is an essential thing to be considered when designing medical equipment some of them are: • 1-material selection: choosing of material is crucial. The material must be biocompatible, corrosion-resistant, possess appropriate mechanical properties, including bending strength. • 2- design and testing: in designing devices, a device must be designed to maximize bending strength, and to distribute load evenly across the structure of that device.
- 6. considerations • 3- manufacturing and quality control: manufacturing process of medical devices and implants should be carefully controlled to ensure that the final product meet the required specifications, including bending strength.
- 7. applications • it’s a very important property for materials used in implants and medical devices, used to evaluate the ability of a material to withstand bending loads: • 1-Bone implants: plates, rods, screws, and etc, all are materials require high consideration for the value of the bending strength. • 2-dental implants: which are used to replace missing teeth and must be able to withstand bending stresses caused by chewing and biting. • 3-cardiovascular valves: some of people are born or may gain distorted heart valve, which may result in the implantation of heart valves-
- 8. applications • - which would be replaced by a surgery. • 4- surgical instruments: such as scissors, forceps and retractors must withstand relatively high bending force without breaking or deforming, especially during surgery, which can be a life-threatening problem.