ISO 10113 specifies a method for determining the plastic strain ratio (often called the r-value) for flat metallic products such as sheet and strip. This value is commonly used to evaluate plastic anisotropy that affects sheet metal forming performance.
If you need help aligning ISO 10113 with your tensile test capabilities (machine capacity, extensometry, and measurement approach), talk with our team about your material, thickness range, and reporting needs.
ISO 10113 — Metallic materials — Sheet and strip — Determination of plastic strain ratio
ISO 10113 is a test-method-style standard focused on measuring plastic strain ratio for metallic sheet and strip. In practice, the r-value is derived from dimensional changes measured during a tensile test on a strip specimen.
Because different editions can change how measurements are taken and how results are reported, it is important to match your procedure to the exact edition cited by your customer or internal specification.
Quick definition
What ISO 10113 does: Defines a standardized approach to determine plastic strain ratio (r-value) for metallic sheet and strip using tensile testing plus dimensional measurement.
What you get from the test: A reported plastic strain ratio value intended to characterize through-thickness plastic anisotropy relevant to forming behavior.
What this standard covers
ISO 10113 applies to flat products (sheet and strip) made of metallic materials. It provides a defined method framework that covers the principle of the measurement, required test equipment, specimen considerations, test procedure, how results are expressed, and what information is included in the test report.
This standard is typically used when r-value reporting is required for material qualification, supplier comparison, or forming-related process control for sheet products.
Why this standard matters in testing
For many sheet-metal applications, tensile strength alone is not enough to predict forming response. Plastic strain ratio is widely used as an indicator tied to how sheet resists thinning during plastic deformation, and it is often used in decision-making for forming feasibility, incoming material checks, and comparative material selection.
From a lab perspective, ISO 10113 pushes attention onto measurement quality (strain measurement and dimensional measurement) and repeatable alignment between specimen preparation, instrumentation, and reporting.
Common materials, product types, or applications covered
ISO 10113 is used with metallic sheet and strip, including materials assessed for sheet-forming behavior. It is commonly encountered anywhere r-value reporting is specified for flat-rolled products.
Typical use cases: Material qualification for forming operations, comparative evaluation of sheet lots, and reporting requirements tied to customer or industry forming-performance expectations.
Common test or verification workflow
ISO 10113 is commonly executed as part of a tensile-testing workflow, with additional focus on capturing the dimensional changes needed to calculate plastic strain ratio.
Common workflow: Prepare sheet/strip tensile specimens, run a controlled tensile test, measure strain and required specimen dimensional changes as defined by the cited edition, calculate the plastic strain ratio, and document results in a test report format aligned to ISO 10113.
Many labs run r-value testing alongside other tensile-derived forming indicators (for example, n-value testing) when required by a customer specification, but those additional values are outside the core result defined by ISO 10113.
Equipment commonly used for this standard
ISO 10113 is typically supported with tensile testing equipment plus appropriate strain and dimensional measurement capability. The exact configuration depends on sheet thickness, expected elongation behavior, and how the cited edition requires measurements to be taken and reported.
Common equipment: Universal testing machine suitable for sheet tensile testing, appropriate grips for flat specimens, extensometry/strain measurement suitable for the required strain range, and tools or systems for measuring specimen dimensions needed for r-value calculation.
If you are selecting a system for routine ISO 10113 testing (or upgrading extensometry and measurement), you can request pricing for an equipment package matched to your sheet material range and throughput.
How to read this designation or revision
Designation format: ISO 10113:YYYY, where “YYYY” is the publication year of the edition being cited.
Edition sensitivity: ISO 10113 has multiple editions, and older editions have been replaced by newer ones. When an RFQ or test request says “ISO 10113,” it is best practice to confirm the year/edition so the lab procedure, calculation approach, and reporting align with the requirement.
Related standards, methods, or frameworks
ISO 10113 is frequently implemented in labs that also control extensometer performance and tensile test measurement quality for metallic materials testing. Depending on your quality system and customer requirements, you may also encounter related references for extensometry or complementary tensile-derived forming metrics.
Commonly associated items: Extensometer verification/calibration standards (where required) and companion tensile-derived parameters (such as n-value) specified by a customer or product requirement.
Get help selecting an ISO 10113 test setup
If you need to match ISO 10113 to a specific sheet product, specimen geometry, or edition year, contact our team and share the standard citation and your material/thickness range so we can help align instrumentation and workflow.