Metal Roofing Strength Test via End Portion Uplift

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Solution Overview

Problem

The existing strength test methods for metal roofing materials, such as cutting out test pieces and applying loads, fail to accurately evaluate the strength of metal roofing materials due to their complex structure and require large-scale, time-consuming and expensive simulations.

Innovation Solution

A method and equipment for testing metal roofing material strength by tightening the material to a base, applying a load to an end portion, and measuring the uplift amount, along with a virtual strength test program that models the material's properties and simulates the loading process to calculate the uplift coefficient, allowing for accurate and efficient evaluation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If a test piece is cut out from the metal roofing material for strength testing, then the test can be performed using standard equipment, but the strength of the metal roofing material cannot be correctly evaluated due to the complex structure

Engineering Contradiction:

Improvetest implementationVSAvoidstrength evaluation accuracy

Core Design Contradiction:

Ease of manufactureVSMeasurement precision

Solution Approach 1:

The test method segments the roofing material into three distinct parts (front substrate, back substrate, and core material) and tests each part separately to evaluate the overall strength. This allows accurate assessment of how each component contributes to the total strength while maintaining ease of testing.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

A base is introduced as an intermediary element to support the front substrate during testing. The base provides a stable reference point for applying loads and measuring deformations, enabling accurate strength evaluation without requiring complex test equipment.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Measurement precision

If a large-scale simulation test using a blower is conducted to test wind resistance, then the strength can be evaluated under realistic conditions, but the test requires time and expense

Engineering Contradiction:

Improvestrength evaluation accuracyVSAvoidtest duration

Core Design Contradiction:

Measurement precisionVSLoss of time

Solution Approach 1:

The essential testing function is extracted from the complex large-scale simulation environment. By isolating the key parameters (front substrate, back substrate, core material, and base) and testing them separately with controlled loads, the method achieves accurate strength evaluation without requiring time-consuming full-scale wind simulation.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The test method performs preliminary strength evaluation by testing the roofing material components separately before conducting full-scale simulation tests. This preliminary testing identifies critical weak points and provides baseline data, reducing the need for extensive time-consuming simulation tests.

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS11275004B2Strength test method for metal roofing material, strength test equipment, and virtual strength test program

Publication Date: 2022.03.15 NISSHIN STEEL CO LTD

AI summary

The present invention provides a method for testing strength of a metal roofing material, the metal roofing material comprising: a front substrate made of a metal sheet; a back substrate arranged on the back side of the front substrate; and a core material filled between the front substrate and the back substrate, the method comprising the steps of: tightening the metal roofing material 1 to a base 50; and applying a load 52L for uplifting an end portion 1E of the metal roofing material 1 tightened to the base 50 to the end portion 1E and measuring an uplift amount of the end portion 1E corresponding to the load 52L.