SL 499-2010 in English

VALID

standard test method for determining residual stresses by the hole-drilling strain-gage method

Issued on:2010-08-20
Implemented on:2010-11-20
File Format:PDF
Delivery:Via email within 1~3 business days

Price(USD)： $330.00
$321.00

Standard No:	SL 499-2010
Document status:	VALID
Title in English:	standard test method for determining residual stresses by the hole-drilling strain-gage method
Title in Chinese:	钻孔应变法测量残余应力的标准测试方法
Language:	English
File Format:	Electronic (PDF)
Delivery:	Via email within 1~3 business days
Issued on:	2010-08-20
Implemented on:	2010-11-20
Professional Classification:	SL-Water Resources
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本标准适用于平面应力梯度较小的残余应力测定。

Introduction

Interpretation of the core content of the standard

Test type	Applicable workpiece	Strain gauge type	Drilling requirements
Uniform stress	Thin workpiece (thickness ≤ 0.4D) or thick workpiece (thickness ≥ 1.2D)	Type A/B/C	Through hole (thin) or blind hole (thick), increment 0.05D
Non-uniform stress	Thick workpiece only (thickness ≥ 1.2D)	Type A/B/C	Blind hole, increment 0.025-0.05mm

Key technical points

1. Strain gauge rosette selection specification

The standard stipulates three types of strain gauge rosette configurations:

Type A: General type, measuring circle diameter D=2.57-10.26mm
Type B: Obstacle-applicable type, strain gauge arranged on one side
Type C: High sensitivity type, using half-bridge circuit

Application case: Selection of Type A for residual stress detection of sluice gate welding class=instrument>C-type strain rosette, with 6-unit arrangement to improve thermal stability, measured the maximum residual stress in the weld area to be 320MPa.

2. Drilling process control

Parameters	Requirements	Allowance deviation
Centering accuracy	Strain rosette center and drilling center	≤±0.004D
Drilling speed	50000-400000r/min	Low-speed drilling machine is prohibited
Tool angle	End face radial clearance angle≤1°	Cone angle≤5°

3. Stress calculation system

Two sets of calculation models are used:

Uniformly distributed stress: Based on the linear elastic theory, formulas (1)-(8) are used to calculate the principal stress
Non-uniformly distributed stress: The Tikhonov regularization method is used to perform matrix operations through formulas (23)-(46)

Accuracy verification: The comparison test of 304 stainless steel samples shows that the standard deviation of the high-speed drilling method is ≤12MPa, while the deviation of the low-speed drilling method is significantly increased.

Standard Evolution and Innovation

Compared with the original ASTM E837-08 standard, SL499-2010 mainly adds:

Appendix A: Drilling eccentricity correction method (derived from CB3395-92)
Appendix B: Hole edge plastic deformation correction technology
Expand the application scenarios of C-type strain rosette

Implementation suggestions

Pre-test verification: Test on a stress-free specimen to confirm that the additional strain is ≤±8με
Data verification: Draw the strain-hole depth curve and eliminate abnormal data that deviates from ±3%
Safety control: When the calculated stress is greater than 60% of the yield limit, it is necessary to indicate in the report that the value may be too high

More samples: DL/T 5154-2012 QC/T 942-2021 NB/T 47013.2-2015

Sample only — not a preview of SL 499-2010

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