ASTM D2290 Apparent Hoop Tensile Strength

Apparent Hoop Tensile Strength test by ASTM D2290 studies the apparent tensile strength of plastic pipes. A specialized test fixture is used to pull apart a sample ring of pipe cut from a larger plastic or reinforced plastic pipe. Apparent composite tensile strength of plastic or reinforced plastic products is determined using this test.

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Overview
Scope, Applications, and Benefits
Test Process
Specifications
Instrumentation
Results and Deliverables

Overview

ASTM D2290 is a test method for determining the apparent hoop tensile strength of plastic and reinforced plastic pipe products. The test method assesses the resistance of pipe materials to circumferential tensile stress through a ring specimen prepared from the pipe.

The test involves separating a pipe ring specimen using a split-disk or ring segment fixture. The test load generates tensile stress in the hoop direction, enabling assessment of the apparent composite tensile strength of the pipe material.

Scope, Applications, and Benefits

Scope

ASTM D2290 is employed for the determination of the comparative apparent tensile strength of plastic and reinforced plastic pipe products. This test procedure applies to pipes subjected to specified pretreatment, environmental conditions, and loading rates.

ASTM D2290 evaluates:

Apparent hoop tensile strength of plastic pipes
Comparative tensile performance of pipe materials
Behaviour of reinforced thermosetting resin pipes
Performance of extruded and molded thermoplastic pipes
Composite tensile strength characteristics

Applications

Plastic piping systems
Reinforced plastic pipes
Thermosetting resin pipe products
Thermoplastic pipes for fluid transport
Construction and infrastructure piping
Product qualification and comparison

Benefits

Provides standardized hoop tensile strength values
Enables comparison between pipe materials and designs
Supports product qualification and validation
Assists in material selection for piping applications
Improves confidence in pipe performance

Test Process

Specimen Preparation & Setup

Ring specimens are cut from the pipe in accordance with ASTM D2290 dimensional requirements and inspected before testing.

Fixture Installation

The ring specimen is installed in a self-aligning split-disk or ring-segment fixture to ensure uniform load distribution.

Load Application

Tensile load is applied circumferentially at a constant crosshead speed specified by the standard.

Data Recording & Evaluation

The maximum load at failure is recorded and used to calculate the apparent hoop tensile strength.

Technical Specifications

Parameter	Details
Applicable Materials	Plastic and reinforced plastic pipes
Specimen Type	Pipe ring specimen
Fixture Type	Split disk or ring-segment fixture
Test Environment	Controlled temperature and humidity
Measured Outputs	Apparent hoop tensile strength

Instrumentation Used for Testing

Universal testing machine
Split disk or ring-segment test fixture
Self-aligning loading fixtures
Load measurement system
Data acquisition and recording software
Calibration and verification equipment

Results and Deliverables

Apparent hoop tensile strength values
Arithmetic mean of test results
Standard deviation of measured values
Average resin content weight percent
Compliance report

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Frequently Asked Questions

ASTM D2290 determines pipe strength by a ring specimen loaded on a split disk fixture, which tests the circumferential tensile properties of the material instead of its flat behavior under direct tension, simulating internal pressure conditions.

Internal pressure generates circumferential stress, which may lead to longitudinal splitting of pipes. The data on hoop strength, as given in ASTM D2290, takes into account the actual operating conditions of pipes.

ASTM D2290 is commonly applied in the oil and gas industry, water treatment industry, aerospace industry, and construction industry, where pipes and pressure vessels are required to resist internal pressure without failure.

ASTM D2290 specifies that ring specimens must be removed from actual pipe or cylindrical specimens. The rings are usually 0.25 to 0.50 inches wide, with wall thickness that is measured accurately for precise strength determination.

Ring specimens retain pipe curvature and manufacturing stresses. ASTM D2290 tests the circumferential strength of a material under diametral loads, providing a realistic hoop performance that flat tensile specimens cannot capture.