Glass-Based Article Stress Profiles for Multiple-Drop Fracture Resistance
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Solution Overview
Problem
Portable electronic devices are vulnerable to damage from accidental drops due to flexure and sharp contact failures, and there is a need for thin, strong glass cover materials that can withstand multiple impacts.
Innovation Solution
Glass-based articles with specific stress profiles, including peak tension and curvature transition points, are developed to enhance fracture resistance, featuring compressive and tensile stress regions designed to absorb impact energy effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If glass thickness is reduced to make devices thinner, then device portability is improved, but fracture resistance deteriorates
Solution Approach 1:
The patent changes the stress distribution parameters within the glass by creating a specific stress profile with a compressive layer at the surface and a tensile layer at the core, through ion exchange process modifications including temperature, time, and chemical composition control
Solution Approach 2:
The patent creates a composite stress structure within the homogeneous glass material, where different regions (compressive layer and tensile layer) have different stress states that work together to enhance overall fracture resistance
2Strength
If peak tension in stress profile is increased to improve fracture resistance, then strength is improved, but manufacturing precision deteriorates due to difficulty in controlling stress distribution
Solution Approach 1:
The patent modifies multiple process parameters including ion exchange temperature, time, and chemical composition to achieve the desired stress profile, allowing control of both peak tension magnitude and its distribution depth
Solution Approach 2:
The patent employs a dynamic two-stage ion exchange process where conditions are adjusted in different stages: first stage creates initial compressive layer, second stage modifies stress distribution to achieve target profile with controlled peak tension
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The stress profiles provide high fracture resistance, allowing the glass-based articles to survive multiple drops without significant damage, maintaining structural integrity and functionality.
Implementation Method 1
glass-based articles herein provide high fracture resistance after multiple drops
Data Source
AI summary
Glass-based articles comprise stress profiles providing improved fracture resistance. The stress profiles contain a high peak tension and a region with a high degree of negative curvature. The glass-based articles herein provide high fracture resistance after multiple drops.