Direct Shear Testing Machine Calibration
(Force & Displacement — ISO 7500-1 / IS 2720)
NABL-accredited calibration of direct shear testing machines — verifying normal load force accuracy, shear force measurement, horizontal displacement (LVDT/dial gauge) and strain rate for IS 2720 Part 13 compliant soil shear strength testing.
What is the Direct Shear Testing Machine Calibration?
The Direct Shear Testing Machine applies a vertical normal force and a horizontal shear force to a soil specimen to determine shear strength parameters (cohesion c, friction angle φ). Both the normal load application system (dead weights or load cell) and the shear force measurement system must be calibrated — along with the horizontal displacement measuring device (LVDT or dial gauge) and the motor-driven shear rate.
At Global Lab, direct shear machine calibration covers: normal load dead weight verification (balance calibration), shear force load cell calibration by NPL-traceable reference (ISO 7500-1), horizontal displacement LVDT/dial gauge calibration (per IS 1317 / ISO 13225), and shear rate motor speed verification — all per requirements of IS 2720 Part 13 and NABL scope.
Non-Destructive
Fast Turnaround
NABL Certified
Pan-India Coverage
Digital Reporting
High Accuracy
Direct Shear Testing Machine Calibration — Site Images
How the Direct Shear Testing Machine Calibration is Conducted
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1
Surface Preparation
A shallow groove (approx. 25mm deep) is cut into the concrete surface using a diamond-tipped cutting tool. The surface is cleaned of dust and debris. -
2
Insert Disc Placement
A specially designed steel insert disc is placed into the groove. A thin rod connects the disc to the pullout apparatus above the surface. -
3
Hydraulic Pullout Force Application
A hydraulic jack applies a steady, controlled pullout force to the insert disc via the reaction ring resting on the concrete surface. -
4
Failure Load Recording
The maximum force at which the concrete cone is extracted is recorded. A digital load indicator provides real-time readings with data logging. -
5
Strength Calculation & Reporting
The pullout force is correlated to cube compressive strength using established calibration curves. NABL-accredited reports are issued via Autovity QLMS.
Applicable Test Standards
| Standard | Title | Scope | Type |
|---|---|---|---|
| ISO 7500-1 | Metallic Materials — Calibration of Static Uniaxial Testing Machines | Force Calibration | ISO |
| IS 2720 Part 13 | Methods of Test for Soils — Direct Shear Test | Direct Shear Test | Indian Standard |
| ISO 13225 | Dimensional Metrology — Local Calibration of Contact Measuring Instruments | Displacement Calibration | ISO |
| NABL-141 | NABL Policy on Metrological Traceability | Traceability | NABL |