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Ultrasonic hardness testing
 

Ultrasonic hardness testing

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    Ultrasonic hardness testing Ultrasonic hardness testing Presentation Transcript

    • For more help contact meMuhammad Umair Bukhari Engr.umair.bukhari@gmail.com www.bzuiam.webs.com 03136050151
    • What is hardness ?Different fields have different conceptsIn metallurgy “the resistance to indentformation or penetration is called hardness”.
    • Why hardness testing?It is done mainly for two reasons: • For research purpose • For application purpose
    • How to measure hardness?There are some well known following methods; o Brinell hardness (HB) o Rockwell hardness (HRC) o Vicker hardness (HV) o Ultrasonic hardness (UCI) Note: there is no conversion of one scale to another.
    • Ultrasonic Hardness• Basic principle: In UCI material is indented by converting electronic frequency into mechanic force and the indentation area size is calculated as a function of electronic frequency.
    • Process description• It is the modified form of Vicker’s hardness testing• Ultrasonic frequency is converted into mechanical force/vidration by Piezo transducer• And the frequency shift is measured with Piezo reciever• Material is indented with Vicker’s oscillating diamond-tipped rod
    • Continue……• Rod is oscillated at a particular frequency• Material is indented with a constant force• All the process completes in very short time
    • Continue….• Vicker hardness equation HV= F/A above equation is modified for ultrasonic frequency shift
    • Piezoelectric Material:• A piezoelectric sensor is a device that uses the piezoelectric effect to measure pressure, acceleration, strain or force by converting them to an electrical signal.