ASTM D6641 - Compressive Properties of Polymer Matrix Composite Materials Using a Combined Loading Compression (CLC) Test Fixture

ASTM D6641

ASTM D6641 is a testing standard that determines the compressive strength and stiffness properties of polymer matrix composite materials using a combined loading compression (CLC) test fixture. This test method is designed to produce compressive property data on polymer matrix - mainly used in the Aerospace industry - for the purposes  of research and development, quality assurance, and structural design and analysis. ASTM D6641 can be used to test unidirectional (0° ply orientation) composites as well as multi-directional composite laminates, fabric composites, chopped fiber composites, and similar materials.

Test Fixture 

A CLC test fixture such as Instron's CP104483 is necessary for performing ASTM D6641 testing. The fixture is placed between two compression platens which initiate the compressive force onto the fixture, which in turn subjects the specimen to a combination of Shear- and End-Loading.

 

ASTM D6641 test fixture

 

Materials Testing System

ASTM D6641 is best performed on a high force universal testing system such as Instron's 5980 Series electromechanical systems with Bluehill Universal software. Though most composites can be tested with a 250kN capacity system, labs testing a wider range of materials may benefit from a higher capacity system. An AlignPRO fixture should be used to ensure accurate results. 




ASTM D6641 Test Setup
1) 5980 Series Universal Testing System
2) Bluehill Universal Software
3) 2580 Series Load Cell
4) CP104483 Custom Test Fixture

 

ASTM D6641 test fixture
Tips and Tricks
  • The specimen may be untabbed (Procedure A) or tabbed (Procedure B), as required. One requirement for a successful test is that the specimen ends do not crush during the test. Untabbed specimens are usually suitable for use with materials of low orthotropy: for example, fabrics, chopped fiber composites, and laminates with a maximum of 50% 0° plies, or equivalent. Materials of higher orthotropy, including unidirectional composites, typically require tabs.
  • The most important results are the compressive strength, the compressive strain and the compressive Poisson’s ratio determined by Chord method. In addition to these calculations, the failure mode of each specimen is documented with the appropriate failure code as described within the standard.
Related Content

複合材料試験治具 - 圧縮

インストロンは、座屈防止ガイドプレートを使用しない圧縮試験治具を提供しています。複合材料の試験において、真の圧縮挙動を観察するため、ゲージ部を拘束しない試験では、しばしばこの方法が求められます。 

複合材料試験のカタログ

インストロンの万能型試験機は、複合材料業界で用いられる一般的なタイプの試験を行えるよう設計されています。具体的には、面内引張、厚さ方向引張、層間せん断、端末負荷圧縮、せん断、または複合荷重、および衝撃後圧縮などが含まれます。

Bluehill Universalの

Bluehill Universalソフトウェアは、タッチ操作と直感的なユーザー体験のために構築されています。あらかじめ備わっている試験メソッド、すぐに試験が開始できるQuickTest、強化されたデータ出力機能、そしてサービスとの直接通信を提供する新機能Instron Connectなど、よりシンプルでスマートな試験をご体感ください。 Bluehill 2やBluehill 3などの旧バージョンソフトは、簡単に最新バージョンのBluehillにアップグレードできます。

5980シリーズデュアルコラム床置きモデル

5980床置きモデルは堅牢で耐久性に優れたフレームであり、一般的に高強度の材料試験、金属および合金、先進的な複合材料、航空宇宙および自動車構造、ボルト、締結部品、および板鋼の試験に使用されています。