Thin Wall Cylinder | FortiTestX – 29
The Thin Wall Cylinder FortiTestX-29 is a benchtop pressure vessel testing unit for engineering laboratories investigating stress and strain in thin-walled cylinders under internal pressure. This thin wall cylinder features an aluminium cylinder (400 mm length, 84 mm outer diameter, 2 mm wall thickness) with a maximum operating pressure of 3 N/mm² (30 bar), generated by a hydraulic hand pump. Five half-bridge strain gauges at 0°, 30°, 45°, 60°, and 90° to the cylinder axis measure hoop and longitudinal strains directly via a 10 V amplifier. The unit switches between open-ended pipe and closed boiler tank configurations for comparative stress state analysis, with optional Windows-based Software FX-29 supporting data logging and Mohr’s Circle visualisation.
The Thin Wall Cylinder FortiTestX-29 is a benchtop apparatus for measuring stress and strain in a thin-walled aluminium cylinder under controlled internal pressure. This thin wall cylinder unit enables investigation of both uniaxial and biaxial stress states by switching between open-ended and closed-ended configurations. Five strain gauges mounted at defined angles on the cylinder surface provide direct strain measurements for Mohr’s Circle analysis and principal stress determination.
Product Overview
The Thin Wall Cylinder FortiTestX-29 is designed for experimental investigation of stresses and strains in thin-walled pressure vessels, with direct application to the design and analysis of pipelines, boiler tanks, and pressure vessels. The main component is an aluminium cylinder with a 400 mm length, 84 mm outer diameter, and 2 mm wall thickness. A moveable piston controlled by a threaded spindle bolt seals one end of the cylinder, allowing selection between two load conditions: the uniaxial stress state of an open-ended pipe, and the biaxial stress state of a sealed container such as a boiler tank. Internal pressure is generated by a hydraulic hand pump fitted with a factory-preset pressure release valve, and is indicated by a pressure gauge graduated to 30 bar. Oil fills the sealed cylinder interior. Five strain gauges are bonded to the outer surface of this thin wall cylinder in half-bridge configuration at angles of 0°, 30°, 45°, 60°, and 90° to the cylinder axis, covering both hoop and longitudinal stress and strain positions. A universal strain gauge amplifier with a 10 V supply reads measured strains directly. Optional Windows-based Software FX-29 enables data logging, graphical strain conversion, and Mohr’s Circle visualisation for identifying principal strains and computing principal stresses through elasticity equations. The hydraulic system is hermetically sealed and maintenance-free.
Thin Wall Cylinder FortiTestX-29, Technical Specifications
| Parameter | Detail |
|---|---|
| Model Reference | FortiTestX-29 |
| Category | Strength of Materials and Structures |
| Cylinder Material | Aluminium |
| Cylinder Length | 400 mm |
| Outer Diameter | 84 mm |
| Inner Diameter | 80 mm |
| Wall Thickness | 2 mm |
| Maximum Internal Pressure | 3 N/mm² (30 bar) |
| Pressure Gauge Range | 0 to 30 bar |
| Pressure Generation | Hydraulic hand pump with factory-preset pressure release valve |
| Hydraulic System | Hermetically sealed, maintenance-free, oil-filled |
| Piston Control | Threaded spindle bolt, hand wheel operated |
| Vessel Configuration | Switchable: open-ended (pipe) or closed-ended (boiler tank) |
| Strain Gauge Quantity | 5 |
| Strain Gauge Configuration | Half-bridges |
| Strain Gauge Angles to Vessel Axis | 0°, 30°, 45°, 60°, 90° |
| Gauge Factor | 2.00 +/- 1% |
| Amplifier Supply Voltage | 10 V |
| Optional Software | Software FX-29 (Windows-based) |
Technical Data
Aluminium Cylinder
| Parameter | Value |
|---|---|
| Length | 400 mm |
| Outer Diameter | 84 mm |
| Inner Diameter | 80 mm |
| Wall Thickness | 2 mm |
| Maximum Internal Pressure | 3 N/mm² (30 bar) |
Strain Gauge System
| Parameter | Value |
|---|---|
| Number of Strain Gauges | 5 |
| Configuration | Half-bridges |
| Angles to Vessel Axis | 0°, 30°, 45°, 60°, 90° |
| Gauge Factor | 2.00 +/- 1% |
| Amplifier Supply Voltage | 10 V |
| Measurement Positions | Hoop and longitudinal stress and strain positions |
Pressure System
| Parameter | Value |
|---|---|
| Pressure Generation | Hydraulic hand pump |
| Pressure Release Valve | Factory-preset |
| Pressure Gauge Range | 0 to 30 bar |
| Hydraulic Fluid | Oil |
| System Type | Hermetically sealed, maintenance-free |
Key Features
- Cylinder Dimensions: aluminium, 400 mm length, 84 mm outer diameter, 80 mm inner diameter, 2 mm wall thickness
- Maximum Internal Pressure: 3 N/mm² (30 bar), generated by hydraulic hand pump
- Dual Vessel Configuration: this thin wall cylinder switches between open-ended pipe and closed-ended boiler tank conditions
- Piston Control: moveable piston operated via threaded spindle and hand wheel for precise pressure sealing
- Strain Gauge Layout: 5 half-bridge gauges at 0°, 30°, 45°, 60°, and 90° to the cylinder axis
- Gauge Factor: 2.00 +/- 1%
- Amplifier Supply Voltage: 10 V, with direct digital strain readout
- Measurement Positions: hoop and longitudinal stress and strain positions on cylinder surface
- Pressure Indication: pressure gauge, 0 to 30 bar range, easy-read display
- Hydraulic System: hermetically sealed, oil-filled, maintenance-free
- Optional Software: Software FX-29, Windows-based, for data logging, graphical strain conversion, and Mohr’s Circle analysis
Experiments
- Measurement of strain using strain gauges
- Application of Mohr’s Circle for stress and strain analysis, determination of the principal strains
- Determination of Poisson’s ratio
- Investigation of correlations between strain, pressure, and stress in the plane biaxial stress state
- Determination of principal stresses: axial and circumferential stresses in magnitude and direction on an open vessel (pipe)
- Determination of principal stresses: axial and circumferential stresses in magnitude and direction on a closed vessel (boiler tank)
- Comparison of open and closed vessel stress states
Construction and Design
The Thin Wall Cylinder FortiTestX-29 is built around an aluminium cylinder measuring 400 mm in length, 84 mm outer diameter, 80 mm inner diameter, and 2 mm wall thickness. One end of this thin wall cylinder is closed; the other is sealed by a moveable piston actuated through a threaded spindle and hand wheel. This configuration allows the unit to replicate either the uniaxial stress state of an open pipe or the biaxial stress state of a sealed pressure vessel. The cylinder interior is filled with oil, and internal pressure is generated by a hydraulic hand pump fitted with a factory-preset pressure release valve. A pressure gauge covering 0 to 30 bar displays the internal pressure. Five strain gauges bonded to the outer cylinder surface in half-bridge configuration are positioned at 0°, 30°, 45°, 60°, and 90° to the cylinder axis, covering both hoop and longitudinal measurement positions. The gauge factor is 2.00 +/- 1%, with a 10 V amplifier supply voltage. The hydraulic system is hermetically sealed and maintenance-free. Optional Software FX-29 interfaces with the amplifier via a Windows-based environment for data logging and graphical results evaluation including Mohr’s Circle.
Software
Software FX-29 (Optional): Windows-based software for data logging, graphical strain conversion, and Mohr’s Circle visualisation for principal strain and stress determination. Compatible with any Windows operating system.
Scope of Delivery
- 1 experimental unit
- 1 instruction manual
Q1: What is the maximum internal pressure the Thin Wall Cylinder FortiTestX-29 can generate?
The maximum internal pressure is 3 N/mm² (30 bar), generated by the hydraulic hand pump with a factory-preset pressure release valve.
Q2: How does this thin wall cylinder switch between open-ended and closed-ended configurations?
A moveable piston controlled by a threaded spindle and hand wheel seals or opens one end of the cylinder, switching between the uniaxial stress state of an open pipe and the biaxial stress state of a closed vessel.
Q3: At what angles are the strain gauges mounted on the cylinder surface?
Five strain gauges in half-bridge configuration are bonded at 0°, 30°, 45°, 60°, and 90° to the cylinder axis, covering hoop and longitudinal stress and strain positions.
Q4: Is Mohr’s Circle analysis supported by this apparatus?
Yes. Optional Software FX-29 provides graphical Mohr’s Circle analysis for identifying principal strains and computing principal stresses from measured strain data.
Q5: Does the hydraulic system require maintenance?
No. The hydraulic system is hermetically sealed and maintenance-free.
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