Constitutive Model Determination via Scaling Reference Curves

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Solution Overview

Problem

The traditional method of constructing a constitutive model for sponge foam materials is time-consuming and labor-intensive, requiring physical tests to obtain stress-strain curves, which limits the ability to quickly evaluate and optimize seat comfort at the initial design stage.

Innovation Solution

A method that determines a reference curve from an existing material database, performs scaling transformations to obtain a stress-strain curve for a material specimen, and uses this curve to directly construct the constitutive model, eliminating the need for tedious compression tests.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If physical compression tests are performed to obtain stress-strain curves for constructing constitutive models, then the accuracy and reliability of the material model is improved, but the time consumption and labor intensity increase significantly

Engineering Contradiction:

Improveaccuracy of constitutive modelVSAvoidtime consumption for physical testing

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The patent uses a reference stress-strain curve from a material database as a template, and applies scaling transformations to create the specific stress-strain curve needed for the constitutive model. This copying approach replaces physical compression tests while maintaining curve accuracy through mathematical transformation, thereby resolving the contradiction between model reliability and time consumption.

Inventive Principle:

Principle #26Copying

Solution Approach 2:

The patent pre-establishes a material database containing reference stress-strain curves before the actual constitutive model construction is needed. By performing the curve selection and scaling preparation in advance, the method eliminates the need for time-consuming physical tests during the model construction phase, thus reducing time loss while ensuring model accuracy.

Inventive Principle:

Principle #10Preliminary action

2Manufacturing precision

If physical compression tests are conducted to obtain material stress-strain curves, then the constitutive model parameters can be accurately fitted, but the complexity of the testing process and equipment requirements increase

Engineering Contradiction:

Improvefitting accuracy of model parametersVSAvoidcomplexity of testing equipment and process

Core Design Contradiction:

Manufacturing precisionVSDevice complexity

Solution Approach 1:

Instead of using complex physical testing equipment to obtain stress-strain curves, the patent copies reference curves from a pre-established material database and applies scaling transformations. This approach achieves the same parameter fitting accuracy without requiring complex compression testing devices or sophisticated test procedures.

Inventive Principle:

Principle #26Copying

Solution Approach 2:

The patent replaces the mechanical compression testing system with a computational system that performs curve selection and scaling transformations. By substituting physical mechanical tests with mathematical operations on digital curves, the method eliminates the need for complex testing equipment while maintaining parameter fitting accuracy.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Reliability

If traditional physical testing methods are used to obtain stress-strain curves, then the material constitutive model can be constructed, but the productivity and efficiency of seat comfort evaluation are reduced

Engineering Contradiction:

Improvevalidity of constitutive modelVSAvoidefficiency of seat comfort evaluation

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The patent copies reference stress-strain curves from a material database and applies scaling transformations to generate the required curves for constitutive model construction. This copying method maintains model validity while dramatically improving the efficiency of seat comfort evaluation by eliminating the need for time-consuming physical tests for each evaluation case.

Inventive Principle:

Principle #26Copying

Solution Approach 2:

The patent transforms the reference stress-strain curve parameters through scaling operations to match the specific material specimen characteristics. By changing the parameters of an existing reliable curve through mathematical transformation rather than physical testing, the method maintains model validity while significantly improving evaluation productivity and efficiency.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS20240354452A1Method for determining material constitutive model, electronic device, and medium

Publication Date: 2024.10.24 BEIJING CHJ AUTOMOTIVE TECH CO LTD

AI summary

A method for determining a material constitutive model includes: determining a reference curve of a material specimen from stress-strain curves in an existing material database obtaining a stress-strain curve corresponding to the material specimen by performing scaling transformation on the reference curve and determining a constitutive model of the material specimen according to the stress-strain curve corresponding to the material specimen.