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Method for a universal 4-point bend test fixture

IP.com Disclosure Number: IPCOM000100611D
Publication Date: 2005-Mar-15
Document File: 3 page(s) / 390K

Publishing Venue

The IP.com Prior Art Database

Abstract

Disclosed is a method for a universal 4-point bend test fixture. Benefits include improved functionality, improved performance, and an improved test environment.

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Method for a universal 4-point bend test fixture

Disclosed is a method for a universal 4-point bend test fixture. Benefits include improved functionality, improved performance, and an improved test environment.

Background

              The conventional bend test method and board designs are not compatible with a developing industry trend. In the conventional bend test, components are subjected to different strain levels (see Figure 1). Only two components out of each board experience the same stress level. Sufficient sample size is not available for board-to-board variation, which leads to a large variation in reliability data.

      The existing test setup induces considerable operator-to-operator variation. This method not ready for high-volume testing.

General description

      The disclosed method is a universal fixture that can do cyclic bend tests for component reliability evaluation and technology certification. This fixture is designed to increase reliability test throughput, reduce cycle time, and improve reliability data accuracy by providing uniform stress conditions across all the units under test.

              The key elements of the method include:

•             Top inner roller assembly that serves two purposes

-         Applies the force to stress the components

-         Controls the precision and consistency of the displacement

•             Bottom fixed roller assembly that serves two purposes
              -             Supports the board during stressing
              -             Provides guided constraints to maintain the board alignment without introducing artificial stresses

Advantages

              The disclosed method provides advantages, including:

•             Improved functionality due to providing a solution that successfully meets industry bend test standards and methods

•             Improved performance due to testing 9 components per board and up to 10 boards simultaneously, increasing throughput by up to 4500%

•            ...