Fatigue multi-damage evaluation method for random ratchet wheel of tank truck

Abstract

The invention relates to a fatigue multi-damage evaluation method for random ratchet of a tank truck, which comprises the following steps: performing fluid-solid coupling random vibration analysis on the tank truck under the action of a road spectrum load to obtain a random fatigue damage coefficient of a concerned position, and simplifying a tank body calculation model and a load of the tank truck on the basis of the random fatigue damage coefficient; applying 0-1 times of equivalent acceleration, 0-2 times of equivalent acceleration and 0-3 times of equivalent acceleration to the simplified model, and performing cyclic plasticity analysis on the premise of applying internal pressure to the tank body within a load range to obtain a ratchet strain rule of a tank body supporting area, so as to obtain a random ratchet effect damage coefficient of the structure; and superposing the random ratchet effect damage coefficient and the random fatigue damage coefficient, and giving a random ratchet fatigue multi-damage coefficient of the tank car supporting area under the action of the road spectrum load, wherein the random ratchet fatigue multi-damage coefficient is used for integrity evaluation of the structure in the region, and when the random ratchet fatigue multi-damage coefficient is not less than 1, fatigue damage is considered to be generated.

Description

technical field [0001] The invention relates to the field of random fatigue damage of tank trucks containing liquid, in particular to a random ratchet fatigue multi-damage evaluation method for tank trucks containing liquid. Background technique [0002] With the rapid development of the energy industry, cryogenic liquid transportation has become an indispensable means of transportation in view of the advantages of efficient transportation of liquefied natural gas (LNG), liquid hydrogen, and liquid oxygen. The road transportation of cryogenic liquids mostly uses semi-trailers, and the inner container of the semi-trailer is used to hold the low-temperature medium. Aiming at the safety problems in the transportation process, JB / T4780-2002 "Liquefied Natural Gas Tank Containers" and JB / T4781-2005 "Liquefied Natural Gas Tank Containers" and JB / T4781-2005 The main design basis given in "Gas Tank Container" is still based on the static strength design of GB150 "Stationary Pressure...

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Problems solved by technology

The road transportation of cryogenic liquids mostly uses semi-trailers, and the inner container of the semi-trailer is used to hold the low-temperature medium. Aiming at the safety problems in the transportation process, JB / T4780-2002 "Liquefied Natural Gas Tank Containers" and JB / T4781-2005 "Liquefied Natural Gas Tank Containers" and JB / T4781-2005 The main design basis given in "Gas Tank Container" is still based on the static strength design of GB150 "Stationary Pressure Vessels" and JB4732-1995 "Steel Pressure Vessels—Analysis and Design Standards". , braking and turning, etc., it is far from enough to use the static strength as the basis for checking the inertial force

[0003] For the support part of the inner container, there is not only a large average stress caused by internal pressure, but also an alternating stress caused by inertial force superimposed on this stress, which is very prone to cyclic plastic accumulation, that is, the ratchet effect and the ratchet effect and low cycle fatigue. Interaction-induced damage destruction

In addition, the tank body will also bear the effect of the road load spectrum during transportation, but the research on the fatigue damage caused by the road load spectrum at the joint between the tank body and the running mechanism and the mutual support between the inner container and the outer shell is still blank, and the high stress at the support position The multi-damage failure evaluation method caused by the interaction between ratchet effect and fatigue has not been established yet

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