ISO 24370:2005 PDF

Fine ceramics (advanced ceramics, advanced technical ceramics) — Test method for fracture toughness of monolithic ceramics at room temperature by chevron-notched beam (CNB) method

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Title (English):

ISO 24370:2005

Fine ceramics (advanced ceramics, advanced technical ceramics) — Test method for fracture toughness of monolithic ceramics at room temperature by chevron-notched beam (CNB) method

Document status:: Active
Format:: Electronic (PDF)
Number of pages:: 15
Publication date:: June 13, 2005
Edition:: ISO IS 24370 edition 1 version 1
ICS:: 81.060.30

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Description (English):

ISO 24370:2005 specifies a test method for determining the fracture toughness of monolithic ceramic materials at room temperature by the chevron-notched beam (CNB) method. ISO 24370:2005 is applicable to monolithic ceramics and whisker- or particulate-reinforced ceramics that are regarded as macroscopically homogeneous. It is not applicable to continuous-fibre reinforced ceramic composites. ISO 24370:2005 is usually applicable to ceramic materials with a fracture toughness less than about 12 megapascal(square root metre). The test method is applicable to materials with a flat crack-growth resistance curve and may be applicable to materials with a rising crack-growth resistance curve (R-curve).

Technical details

Technical committee: ISO/TC 206 - Fine ceramics
SKU: ISO 24370:2005

Abstract

Overview

ISO 24370:2005 defines a standardized laboratory test method - the chevron‑notched beam (CNB) method - for determining the fracture toughness of monolithic and macroscopically homogeneous whisker- or particulate‑reinforced ceramics at room temperature. The method measures a fracture toughness value (K_I,CNB) by fracturing a chevron‑notched beam under four‑point flexure and calculating the stress intensity from the fracture load and a geometry‑dependent coefficient. The standard is intended for fine/advanced ceramics with fracture toughness generally less than about 12 MPa·√m and is suited to materials with a flat crack‑growth resistance curve (and may be applied to some R‑curve materials). It is not applicable to continuous‑fibre reinforced ceramic composites.

Key Topics and Requirements

Test principle: four‑point flexure of a chevron‑notched beam; record force vs displacement, backface strain or time to detect stable crack growth.
Specimen geometry: rectangular beams with defined tolerances (example recommended cross‑section and dimensions are provided in the standard); notch tip and chevron dimensions controlled precisely.
Notch preparation: chevron notch cut with fine diamond grit; notch thickness (kerf) ≤ 0.30 mm and notch planes must meet within 0.06 mm; narrow notches encourage stable crack extension.
Apparatus:
- Universal test machine meeting ISO 7500‑1 accuracy requirements.
- Flexure fixtures complying with ISO 14704, with specified inner/outer spans and rolling bearings.
- Micrometer (resolution 0.002 mm) and optical microscope for notch and specimen measurements.
- Stability detection equipment (backface strain gauges or local extensometers preferred).
Data and calculations: compute K_I,CNB from measured fracture load and minimum stress intensity coefficient Y*; follow the standard’s formulas and validity checks.
Validity: suitable for materials with relatively low-to-moderate toughness and where stable crack growth from the chevron notch can be achieved.

Applications and Users

ISO 24370 is used for:

Material development and comparison of monolithic advanced ceramics.
Quality assurance and batch verification in ceramic production.
Generation of fracture toughness data for design, reliability analysis and failure investigations. Typical users:
Materials and ceramics engineers, R&D and metrology labs, quality control teams, and standards bodies involved in fine/advanced ceramics testing.

Related Standards

ISO 7500‑1:2004 - Verification of static uniaxial testing machines (force measurement).
ISO 14704:2000 - Test method for flexural strength of monolithic ceramics (fixture requirements).
ISO/TC 206 - Technical committee for Fine ceramics (development context).

Keywords: ISO 24370, CNB method, chevron‑notched beam, fracture toughness, K_I,CNB, monolithic ceramics, fine ceramics, test method, four‑point flexure, notch preparation.

Related standards

Standards mentioned in the description

Abstract

Overview

Key Topics and Requirements

Test principle: four‑point flexure of a chevron‑notched beam; record force vs displacement, backface strain or time to detect stable crack growth.
Specimen geometry: rectangular beams with defined tolerances (example recommended cross‑section and dimensions are provided in the standard); notch tip and chevron dimensions controlled precisely.
Notch preparation: chevron notch cut with fine diamond grit; notch thickness (kerf) ≤ 0.30 mm and notch planes must meet within 0.06 mm; narrow notches encourage stable crack extension.
Apparatus:
- Universal test machine meeting ISO 7500‑1 accuracy requirements.
- Flexure fixtures complying with ISO 14704, with specified inner/outer spans and rolling bearings.
- Micrometer (resolution 0.002 mm) and optical microscope for notch and specimen measurements.
- Stability detection equipment (backface strain gauges or local extensometers preferred).
Data and calculations: compute K_I,CNB from measured fracture load and minimum stress intensity coefficient Y*; follow the standard’s formulas and validity checks.
Validity: suitable for materials with relatively low-to-moderate toughness and where stable crack growth from the chevron notch can be achieved.

Applications and Users

ISO 24370 is used for:

Material development and comparison of monolithic advanced ceramics.
Quality assurance and batch verification in ceramic production.
Generation of fracture toughness data for design, reliability analysis and failure investigations. Typical users:
Materials and ceramics engineers, R&D and metrology labs, quality control teams, and standards bodies involved in fine/advanced ceramics testing.

Related Standards

ISO 7500‑1:2004 - Verification of static uniaxial testing machines (force measurement).
ISO 14704:2000 - Test method for flexural strength of monolithic ceramics (fixture requirements).
ISO/TC 206 - Technical committee for Fine ceramics (development context).

Keywords: ISO 24370, CNB method, chevron‑notched beam, fracture toughness, K_I,CNB, monolithic ceramics, fine ceramics, test method, four‑point flexure, notch preparation.

ISO 24370:2005 PDF

Technical details

Abstract

Overview

Key Topics and Requirements

Applications and Users

Related Standards

Related standards

Abstract

Overview

Key Topics and Requirements

Applications and Users

Related Standards

Related standards

Metallic materials — Verification of static uniaxial testing machines — Part 1: Tension/compression testing m…

Fine ceramics (advanced ceramics, advanced technical ceramics) — Test method for flexural strength of monolit…

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