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Computer dynamic simulation method of determining true strain rate effect of seawater aggregate concrete

A real strain and dynamic simulation technology, applied in design optimization/simulation, calculation, special data processing applications, etc., to achieve the effect of avoiding the increase of compressive strength, fast results, and good practical value

Active Publication Date: 2017-03-15
LOGISTICAL ENGINEERING UNIVERSITY OF PLA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a computer dynamic simulation method for determining the real strain rate effect of seawater aggregate concrete, aiming at solving the problem of accurately considering the strain rate effect of porous concrete materials in the design of protective engineering

Method used

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  • Computer dynamic simulation method of determining true strain rate effect of seawater aggregate concrete
  • Computer dynamic simulation method of determining true strain rate effect of seawater aggregate concrete
  • Computer dynamic simulation method of determining true strain rate effect of seawater aggregate concrete

Examples

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Effect test

Embodiment 1

[0068] Example 1, matrix strength 70.5Mpa, theoretical porosity 10% seawater aggregate concrete:

[0069] Calculate the "reconstructed" stress-strain curves of seawater aggregate concrete with a theoretical porosity of 10% at three strain rate levels of 70 / s, 100 / s and 140 / s, Figure 5 is the measured incident stress wave corresponding to the three strain rate levels; the basic physical parameter density of the incident rod and the transmitted rod is 7850kg / m 3 , modulus of elasticity 210GPa, Poisson's ratio 0.3, compressive strength 400MPa; basic physical parameters density of seawater aggregate concrete matrix 2172kg / m 3 , Elastic modulus 24.2GPa, Poisson's ratio 0.21; seawater aggregate concrete matrix friction angle β=46°, expansion angle ψ=β=46°, off-plane parameter K=1; Figure 6 It is a structured grid of one eighth cell of seawater aggregate concrete with a theoretical porosity of 10%, and the cell size is 8.7656mm×8.7656mm×8.7656mm, Figure 7 It is a quarter structu...

Embodiment 2

[0071] Embodiment 2, matrix strength 70.5Mpa, theoretical porosity 20% seawater aggregate concrete:

[0072] Calculate the "reconstructed" stress-strain curves of seawater aggregate concrete with a theoretical porosity of 20% at three strain rate levels of 70 / s, 100 / s and 140 / s, Figure 9 is the measured incident stress wave corresponding to the three strain rate levels; the basic physical parameter density of the incident rod and the transmitted rod is 7850kg / m 3 , modulus of elasticity 210GPa, Poisson's ratio 0.3, compressive strength 400MPa; basic physical parameters density of seawater aggregate concrete matrix 2172kg / m 3 , Elastic modulus 24.2GPa, Poisson's ratio 0.21; seawater aggregate concrete matrix friction angle β=46°, expansion angle ψ=β=46°, off-plane parameter K=1; Figure 10 It is a structured grid of one-eighth cell of seawater aggregate concrete with a theoretical porosity of 20%, and the cell size is 7.000mm×6.8930mm×6.8930mm, Figure 11 The theoretical por...

Embodiment 3

[0074] Example 3, the matrix strength is 70.5Mpa, the theoretical porosity is 30% seawater aggregate concrete:

[0075] Calculate the "reconstructed" stress-strain curves of seawater aggregate concrete with a theoretical porosity of 30% at three strain rate levels of 70 / s, 100 / s and 140 / s, Figure 13 is the measured incident stress wave corresponding to the three strain rate levels; the basic physical parameter density of the incident rod and the transmitted rod is 7850kg / m 3 , modulus of elasticity 210GPa, Poisson's ratio 0.3, compressive strength 400MPa; basic physical parameters density of seawater aggregate concrete matrix 2172kg / m 3 , Elastic modulus 24.2GPa, Poisson's ratio 0.21; seawater aggregate concrete matrix friction angle β=46°, expansion angle ψ=β=46°, off-plane parameter K=1; Figure 14 It is a structured grid of one-eighth cell of seawater aggregate concrete with a theoretical porosity of 30%, and the cell size is 5.9033mm×6.1667mm×6.1667mm, Figure 15 It is ...

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Abstract

The invention discloses a computer dynamic simulation method of determining a true strain effect of a seawater aggregate concrete. A disconnect-type Hopkinson compression bar test and a corresponding finite element analytical model of the seawater aggregate concrete are utilized. The method comprises the steps of using a measured compression bar incident wave as an input stress wave of the finite element model; selecting and using an extended Drucker-Prager model as a material model of the seawater congregate concrete basal body, wherein the strain rate effect is not set, and only simulating the increase of the strength of the seawater congregate concrete caused by a sidewise inertial confinement effect under a high strain rate; determining the true strain rate effect of the seawater congregate concrete according to the strain rate effect obtained through compression bar test and the strain rate effect caused by the sidewise inertial and end face friction. According to the computer dynamic simulation method of determining the true strain effect of the seawater aggregate concrete, the situation that a complicatedly designed test decouples the true strain rate effect of the seawater congregate concrete with a structure of an inner shell body and the strain rate effect caused by the sidewise restraint is avoided, the result is quick and accurate, and the computer dynamic simulation method of determining the true strain effect of the seawater aggregate concrete has better practical value.

Description

technical field [0001] The invention belongs to the technical field of civil engineering materials and computer applications, and in particular relates to a computer dynamic simulation method for determining the real strain rate effect of seawater aggregate concrete. Background technique [0002] The South China Sea is an important channel for international ocean transportation, rich in fishery and oil and gas resources, and its strategic position is extremely important. In order to strengthen the deployment of military forces in the region and safeguard maritime rights and interests, my country has begun to rely on natural islands and reefs in the South China Sea to carry out large-scale military and related civilian construction. However, the islands and reefs in the South China Sea are far away from the mainland, and the available construction resources are scarce. There are problems in the construction of islands and reefs, such as difficulties in transportation and const...

Claims

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Application Information

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IPC IPC(8): G06F17/50
CPCG06F30/23
Inventor 程华周凌邓智平
Owner LOGISTICAL ENGINEERING UNIVERSITY OF PLA
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