ISO 6892 Tensile Testing of Metallic Materials

How to Perform a Tensile Test on Metals to ISO 6892

ISO 6892 sheet metal


ISO 6892-1 is one of the most commonly adopted testing standards for the tensile testing of metallic materials at ambient temperature. The most recent version of this standard was released in 2016 and describes three different test methods: Method A1, Method A2, and Method B. ISO 6892-1 is similar but not equivalent to ASTM E8/E8M. This guide is designed to introduce you to the basic elements of an ISO 6892-1 tensile test and will provide an overview of the materials testing equipment, software, and tensile specimens needed. However, anyone planning to conduct testing should not consider this guide an adequate substitute for reading the full standard.

Evolution of the Standard

ISO 6892-1:2016 is the current version of a metals testing standard that has undergone several iterations. Instron actively participates on the committee, which allows us to ensure that our products are compliant with the standard and that our team is educated about upcoming changes. The prior version, ISO 6892-1:2009, was itself a replacement of both the former ISO 6892 standard and also the popular EN10002-1:2001 standard.

One of the greatest evolutions of ISO 6892-1 has been largely related to test control methods, which can pose a significant challenge in metals tensile testing. This evolution was mainly lead by the work conducted as part of the TENSTAND project, where it was identified that the test rates between different machines testing to the same standard will yield different results due to materials' strain rate sensitivity. The 2009 version introduced testing rates based on strain rate (Method A), which became the preferred method. The traditional test method inherited from EN10002:2001 was based on maintaining a stress rate during the elastic region, which was needed for manually-operated machines. This original method was also retained, and became 'Method B' in the 2009 version of the standard.

The introduction of Method A caused confusion, as many users thought Method A was only achievable by using equipment capable of closed-loop strain control, where instead it could also be accomplished by using a consistent crosshead speed. To clarify this situation, ISO 6892-1 was revised again into the current version, ISO 6892-1:2016. The 2016 version includes three test methods, A1, A2, and B, where the former Method A is split into two different clearly-defined test methods, Method A1 (closed-loop strain control) and Method A2 (consistent crosshead speed) while Method B continues to be based on maintaining a stress rate during the elastic region. A note was added to Method B to clarify the range of the test where a stress control must be maintained. The video below discusses Method A1 in greater detail.

What Does it Measure?

ISO 6892-1 measures the tensile properties of metallic materials in any form at an ambient temperature. Tests carried out under controlled conditions must be made at a temperature of 23 degrees Celsius plus or minus 5 degrees. ISO 6892-1 measures many different tensile properties, with the following being the most common:

Yield Strength - The stress at which a material becomes permanently deformed. ISO 6892-1 determines both upper and lower yield strength: depending on the yielding phenomena, ISO 6892-1 specifies both upper and lower yield strength requirements for discontinuously yielding material and the offset yield method for continuously-yielding material. 

Yield Point Elongation - Only suitable for discontinuously yielding material, the Yield Point Elongation is the difference between the elongation of the specimen at the start and at the finish of discontinuous yielding (the area in which an increase in strain occurs without an increase in stress).

Tensile Strength - The maximum force or stress that a material is capable of sustaining during a tensile test.

Reduction of Area - A measurement of the ductility of a material. This is the difference between the original cross sectional area of a specimen and the area of its smallest cross section after testing, usually expressed as a percentage decrease in original cross section. The smallest cross section can be measured at or after fracture.


Metal Yield Types



ISO 6892-1 accommodates a wide variety of specimen types due to the huge range of applications that metallic materials are used for. Primary specimen types include sheets, plates, wires, bars, and tubes. Full details on specimen preparation and measuring can be found in the annexes:

Annex B: Types of test pieces to be used for thin products: sheets, strips, and flats between 0, 1, and 3 mm thick.

Annex C: Types of test pieces to be used for wire, bars, and sections with a diameter or thickness of less than 4 mm.

Annex D: Types of test pieces to be used for sheets and flats of thickness equal to or greater than 3 mm, and wire, bars, and sections of diameter or thickness equal to or greater than 4 mm.

Materials Testing System

Because ISO 6892-1 testing is conducted on a wide variety of metals, system force requirements can differ greatly. The force measuring system of the testing machine must be in accordance with ISO 7500-1, class 1, or better. The Instron® 5900 Series offers test frames suitable for testing sheet metal (10kN) all the way up to steel plate (600kN). The 5900 Series provides a superior load frame including pre-loaded bearings, precision ball screws, an extremely stiff crosshead and base beam, and low-stretch drive belts. These features contribute to an overall advanced performance, producing highly accurate results. The features also help to minimize the energy stored during a test, which is especially evident when testing high-strength metallic materials to ISO 6892-1.

Instron 5900 series


There are many different gripping technologies suitable for ISO 6892-1 testing (wedge, hydraulic, pneumatic, etc.) they can all be classified as either proportional or non-proportional according to the way in which they exert clamping force on the specimen.

With proportional grips, the force exerted on the specimen is proportional to the tensile load being applied. As tensile load increases during a test, so does the gripping force on the specimen. Wedge grips are a popular option for proportional gripping and come in manual, pneumatic, and hydraulic varieties to suit a wide range of testing applications. The shape of a wedge grip is what allows it to exert proportional pressure: as tensile force is applied to the specimen, the specimen is pulled more tightly into the narrowest area of the wedge, increasing the gripping pressure.

With non-proportional grips, the clamping force on the specimen remains consistent and is independent of the tensile load being applied. This is typical of side-acting grips and fatigue-rated hydraulic wedge grips where the clamping force is generated by a power source that is not directly associated with the tension loading of the specimen. This source is typically a high pressure (210 bar/3000 psi or higher) hydraulic supply. One benefit of non-proportional grips is that the clamping force is typically more adjustable, which offers more potential application advantages. For example, when testing non-machined specimens, fine adjustments can help users achieve optimal gripping pressure while minimizing stress concentrations that could cause premature failure.

high force Instron grips


There are three different types of extensometers that are typically used for ISO 6892-1 testing: clip-on devices, non-contacting devices, and automatic contacting extensometers. Depending on the calculations needed, extensometers must be in accordance with ISO 9513 class 1 or 2. Clip-on extensometers such as the 2630 Series are the most common type used. These devices can provide incredibly accurate and stable strain data and are typically cheaper to purchase than other types. They need to be robust enough to survive high-throughput testing labs and absorb any shock from the breaking of high-capacity metallic specimens if not removed during the test.

Automatic contacting devices such as the AutoX750 offer the benefit of repeatable clamping forces and placement, which can reduce variances between different operators placing clip-on extensometers manually. Automatic contacting devices can also adapt to multiple gauge lengths, which can be cost effective for users who need to test a variety of specimen types. The AutoX is designed to be robust enough to remain on throughout the test through failure. However, when combined with Bluehill® Universal software, the AutoX750 can be set up to remove itself automatically just before specimen failure in order to prevent any excessive wear to the knife edges.

Non-contacting devices such as the AVE 2 Automatic Video Extensometer offer the benefit of removing any influence incurred by the extensometer making physical contact with the specimen. For instance, if a test specimen is very thin, such as with packaging metals, the weight of a clip-on device can alter the results considerably. The knife edges used to affix the device to a fragile specimen can also damage the specimen and cause premature failure. Furthermore, because the AVE does not contact the material, there is no potential for the extensometer to be damaged or worn when testing high-capacity materials.




Testing Software

Nearly all modern testing machines come with pre-installed software, and it is important that the calculations in the testing software are in compliance with ISO 6892-1 and match with existing data. Not all software packages are created equal, and it is important to know that the platform you choose provides reliable results.

Thousands of customers around the globe rely on Bluehill Universal® to test their material to ISO 6892-1. All calculations required in ISO 6892-1 testing are already pre-configured into Bluehill Universal, but for those who prefer to start from scratch and build their own method, the interface makes it easy for users to manually input their own calculations. The metals methods package also provides pre-built methods to all of the following standards: ASTM E8 / E8M, ASTM A370, ASTM 615, ASTM E646, ASTM E517, EN10002, ISO10113 & ISO10275.


Most labs testing to ISO 6892-1 need to test a high volume of specimens on a regular basis. For this reason, anything that can be done to increase throughput is advantageous. Fortunately, there are many options for increasing a lab's testing throughput. Small software modifications can reduce repetitive tasks, and some grips and extensometers can reduce setup time and increase repeatability, which will reduce the need to run retests. Finally, there is the option to fully automate the entire testing process, which allows testing to run for several hours without the need for any operator interaction.


ISO 6892-1:2016の規格の更新について

このホワイトペーパーでは、ISO 6892-1:2016が、旧バージョン規格であるISO 6892-1:2009からどのように更新されたか詳しく説明します。特に、2009年版の「A法」が、現在ではA1とA2の2つの試験メソッドに分割されたことが説明されています。

  • ホワイトペーパー
  • 0.5 MB

ISO 6892-1:2009ホワイトペーパー:引張試験用金属材料

このホワイトペーパーでは、旧バージョンのISO 6892と、広く使われているEN 10002-1:2001規格の両方を、新しい規格がどのように置き換えるかを詳しく説明します。金属材料の引張試験を行う方に向けた非常に役立つ参考資料です。 インストロンの試験機は、★ ★ISO 6892-1:2009の厳しい要求事項を、★ ★ひずみ速度制御に基づくA法および応力速度に基づくB法の両方で満たしています。

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  • 2013年2月14日
  • 374.7 KB

新しいISO 6892-1:2016規格について学ぶ


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ISO 6892-1:2016を理解する - Matthew Spiret氏に聞く

ISO 6892-1:2016の採用と、インストロン試験機が規格に概説された新しい試験メソッドにどのように準拠できるかについて、AZO Materialsが金属試験専門家であるMatthew Spiret氏にインタビューしました。

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新しいISO 6892-1:2016について - A法を理解する

ISO 6892-1の歴史を紐解き、新しい試験メソッドA1およびA2について詳しく説明するウェビナーです。

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自動接触式伸び計 - AutoX 750モデル

AutoX 750は、高分解能で長伸度の自動接触式伸び計です。電気機械式の3300、5500、5900の卓上型および床置型システムに加え、LX、DX、HDX、KNの静止型油圧試験システムに取り付けることが可能です。プラスチック、金属、バイオメディカル、複合材料、エラストマーなどの用途に適しています。AutoXは、最大750 mmの移動量と±1μmの精度を備えています。

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5900シリーズ 最高クラスの試験システム

5900万能試験システムは、高精度に設計され、耐久性に優れ、変化する要件に柔軟に対応できる試験機です。これらの製品は、試験効率を高め、オペレーターの試験経験を向上させるための標準機能およびオプション機能を備えています。100 Nから最大600 kNまでの試験容量に対応した豊富なモデルを用意しています。

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Bluehill Universalのカタログ

Bluehill Universalソフトウェアは、タッチ操作と直感的なユーザーエクスペリエンスを念頭に構築されています。標準装備の試験メソッド、数秒で行われるQuickTest、強化されたデータエクスポート、そしてサービスとの直接通信を提供する新機能Instron Connectなどの機能が、従来よりシンプルでスマートな試験を可能にします。 Bluehill 2やBluehill 3などの旧バージョンソフトからは、簡単に最新バージョンのBluehillにアップグレードできます。

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