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A Time-varying Reliability Design Method for Rectangular Plate Structures with Initial Defects

A design method and rectangular plate technology, applied in computing, special data processing applications, instruments, etc., can solve problems such as inability to strictly meet requirements, waste of resources, time cost, and large safety redundancy, so as to reduce design cycle and economical Effects of cost, improved performance, and reduced structural weight

Active Publication Date: 2018-08-17
BEIHANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, the relevant research work is still immature, and the scheme design for the proposed slab structure with defects often cannot strictly meet the required application requirements, or the safety redundancy is too large, resulting in serious waste of resources and time cost

Method used

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  • A Time-varying Reliability Design Method for Rectangular Plate Structures with Initial Defects
  • A Time-varying Reliability Design Method for Rectangular Plate Structures with Initial Defects
  • A Time-varying Reliability Design Method for Rectangular Plate Structures with Initial Defects

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Embodiment

[0114] In order to understand more fully the characteristics of the invention and its applicability to engineering practice, the present invention aims at such as figure 2 The proposed rectangular plate structure with initial defects 20Cr2Ni4A material is optimally designed based on time-varying reliability. The two ends of the rectangular plate structure are subjected to eccentric alternating tensile load P, and the explicit expression of the stress range Δσ can be solved by considering the geometric dimensions, initial crack conditions and loading conditions, as follows: Here, the calculation of Δσ can be equivalent to the normal stress under tension along the central axis and the maximum normal stress under pure bending superposition (see image 3 ). Based on the classic Paris formula, the crack growth rate can be further calculated an explicit expression for Table 1 gives the uncertainty information of the rectangular plate structure in the examples.

[0115] T...

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Abstract

The invention discloses a time-variant reliability design method for a rectangular plate structure with initial defects. The method comprises the steps of firstly, according to stress characteristics of the defected plate structure, considering indeterministic effects of parameters such as a load, material characteristics, a design permissible value and the like under a finite sample condition, and establishing a non probability interval process model of crack expansion length of the rectangular plate structure; secondly, based on a classic Paris damage evolution formula and a first passage theory, constructing a time-variant reliability measurement model of the structure with the initial defects; and finally, by taking the reliability as a constraint condition, the weight reduction as an optimization target and the plate thickness as a design variable, performing repeated iterations to obtain an optimal design scheme of the structure within a set service time. According to the method, the comprehensive influence of indeterminacy on power safety of the structure with the initial defects within a set life cycle is reasonably characterized in an optimization design process, and the weight can be effectively reduced, thereby ensuring the safety and economy of the design.

Description

technical field [0001] The present invention relates to the technical field of optimal design of plate structures with initial defects, and in particular to a time-varying reliability design method for plate structures with initial defects. Quantitative characterization and formulation of the uncertainty optimization scheme for the proposed cracked rectangular plate structure under the constraint of time-varying reliability index. Background technique [0002] Due to the small thickness, light weight, less consumables and good performance, the plate structure becomes a structural element with excellent characteristics. In addition, in view of its own advantages such as regular structure, easy processing and disassembly, and portable transportation, the plate structure is not only widely used in military fields such as aerospace, ships, weapons, etc., but also frequently appears in bridges as the most basic and important components. , buildings and other civil structural sys...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F17/50
CPCG06F30/367
Inventor 王磊王晓军李晓耿新宇邱志平
Owner BEIHANG UNIV
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