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RESEARCH ON SHUTDOWN STRESS AND FATIGUE LIFE OF AIR CONDITIONING PIPING
It is very important to determine the reasonable shutdown stress of air-conditioning piping,and it is related to the piping reliability and development cost. Firstly,the piping shutdown stress was studied through a large number of stress tests and statistical analysis methods. Then the piping shutdown fatigue life was calculated based on the force number and S-N fatigue life curve. Finally,the fatigue acceleration tests of pipe fitting under single part and complete machine assembly are carried out respectively. The results show that: The piping will be subjected to 2 ～ 3 stress shocks at the shutdown moment,the average number of shocks is 2. 6 times; The first impact stress is the largest,and the subsequent impact stress attenuates slightly;Vibration table and counterweight block can be used to generate stable stress impact,which can reach millions of times in a short time,and the component fatigue can be verified quickly; Piping bending will reduce the piping fatigue life,the operating pressure and temperature have little influence on pipe fatigue life,welding has little influence on piping,since there is a distance between the welded part and the bent part; In order to ensure the piping reliability under the limit state,the piping shutdown stress should be below 62 MPa.
RESEARCH ON SHUTDOWN STRESS AND FATIGUE LIFE OF AIR CONDITIONING PIPING
It is very important to determine the reasonable shutdown stress of air-conditioning piping,and it is related to the piping reliability and development cost. Firstly,the piping shutdown stress was studied through a large number of stress tests and statistical analysis methods. Then the piping shutdown fatigue life was calculated based on the force number and S-N fatigue life curve. Finally,the fatigue acceleration tests of pipe fitting under single part and complete machine assembly are carried out respectively. The results show that: The piping will be subjected to 2 ～ 3 stress shocks at the shutdown moment,the average number of shocks is 2. 6 times; The first impact stress is the largest,and the subsequent impact stress attenuates slightly;Vibration table and counterweight block can be used to generate stable stress impact,which can reach millions of times in a short time,and the component fatigue can be verified quickly; Piping bending will reduce the piping fatigue life,the operating pressure and temperature have little influence on pipe fatigue life,welding has little influence on piping,since there is a distance between the welded part and the bent part; In order to ensure the piping reliability under the limit state,the piping shutdown stress should be below 62 MPa.
RESEARCH ON SHUTDOWN STRESS AND FATIGUE LIFE OF AIR CONDITIONING PIPING
WANG Xuan (author) / ZHANG JieXi (author) / HUANG JianNan (author)
2021
Article (Journal)
Electronic Resource
Unknown
Metadata by DOAJ is licensed under CC BY-SA 1.0
HPAC engineering : heating, piping, air conditioning engineering
TIBKAT | Nachgewiesen 2003 -
HPAC engineering : heating, piping, air conditioning engineering
UB Braunschweig | Nachgewiesen 2003 -
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