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BS ISO 26843:2015

BS ISO 26843:2015

$189.07

Metallic materials. Measurement of fracture toughness at impact loading rates using precracked Charpy-type test pieces

Published By Publication Date Number of Pages
BSI 2015 46
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This International Standard specifies requirements for performing and evaluating instrumented precracked Charpy impact tests on metallic materials using a fracture mechanics approach. Minimum requirements are given for measurement and recording equipment such that similar sensitivity and comparable measurements are achieved.

Dynamic fracture mechanics properties determined using this International Standard are comparable with conventional large-scale fracture mechanics results when the corresponding validity criteria are met. Because of the small absolute size of the Charpy specimen, this is often not the case. Nevertheless, the values obtained can be used in research and development of materials, in quality control, and to establish the variation of properties with test temperature under impact loading rates.

Fracture toughness properties determined through the use of this International Standard may differ from values measured at quasistatic loading rates. Indeed, an increase in loading rate causes a decrease in fracture toughness when tests are performed in the brittle or ductile-to-brittle regimes; the opposite is observed (i.e. increase in fracture toughness) in the fully ductile regime. More information on the dependence of fracture toughness on loading (or strain) rate is given in Reference [1]. In addition, it is generally acknowledged that fracture toughness also depends on test temperature. For these reasons, the user is required to report the actual test temperature and loading rate for each test performed.

In case of cleavage fracture of ferritic steels in the ductile-to-brittle transition region, variability can be very large and cannot be adequately described by simple statistics. In this case, additional tests are required and the analysis is to be performed using a statistical procedure applicable to this type of test, see for example Reference [2].

NOTE

Modifications to the analytical procedures prescribed in Reference [2] might be necessary to account for the effect of elevated (impact) loading rates.

PDF Catalog

PDF Pages PDF Title
6 Foreword
7 Introduction
9 1 Scope
2 Normative references
3 Symbols
11 4 Principle
13 5 Test specimens
14 6 Testing machines
7 Test procedures and measurements
7.1 General
15 7.2 Impact velocity
7.3 Time to fracture
7.4 Multiple specimen tests
7.5 Single-specimen tests
16 7.6 Post-test crack length measurements
8 Evaluation of fracture mechanics parameters
17 9 Test report
9.1 Organization
9.2 Specimen, material, and test environment
9.2.1 Specimen description
9.2.2 Specimen dimensions
9.2.3 Material description
18 9.2.4 Test environment
9.3 Fatigue precracking conditions
9.4 Test data qualification
9.4.1 Limitations
9.4.2 Crack length measurements
9.4.3 Fracture surface appearance
9.4.4 Resistance curves
9.4.5 Checklist for data qualification
19 9.5 Test results
20 AnnexĀ A (normative) Test machines suitable for each test procedure
21 AnnexĀ B (informative) Estimation of strain rate
22 AnnexĀ C (normative) Dynamic evaluation of fracture toughness
27 AnnexĀ D (normative) Determination of resistance curves at impact loading rates by multiple specimen methods
29 AnnexĀ E (normative) Estimation of Jd-Ī”a R-curves using the normalization method
32 AnnexĀ F (normative) Determination of characteristic fracture toughness value J0,2Bd
33 AnnexĀ G (normative) Validity criteria
35 AnnexĀ H (normative) Determination of fracture toughness in terms of J-integral
37 AnnexĀ I (informative) Example test reports
42 Bibliography

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BS ISO 26843:2015
$189.07