Buckling of Bars | FortiTestX-44
The Buckling of Bars FortiTestX-44 is a structural mechanics laboratory unit for investigating elastic buckling behaviour in slender bars under compressive loading, mounted in the SM-1400F frame. This buckling of bars apparatus includes seven test bars across steel and aluminium in four cross-section configurations, with pinned or fixed end conditions to cover all standard Euler buckling cases. Force is measured up to +5 kN, and lateral deflection is recorded by two dial gauges over a 0 to 10 mm range at 0.01 mm graduation. A cable and pulley shear force experiment extends the unit to combined compressive and lateral loading conditions, with all components stored in a 1170 x 480 x 178 mm storage system.
The Buckling of Bars FortiTestX-44 is a structural mechanics laboratory unit for demonstrating and investigating elastic buckling behaviour in bars under compressive loading. This buckling of bars apparatus supports systematic variation of support conditions, cross-sections, materials, and additional shear forces, enabling full experimental verification of Euler’s buckling theory. Force and lateral deflection are measured directly through an integrated force gauge and two dial gauges.
Product Overview
The Buckling of Bars FortiTestX-44 provides a clear and controlled demonstration of elastic buckling in long slender bars subjected to compressive forces along their longitudinal axis. When a critical compressive force is reached, such bars lose stability and deflect laterally without material failure, remaining within the elastic stress zone. The apparatus includes a load mechanism for applying compressive forces to test bars that can be pinned or fixed at both ends depending on the buckling condition under investigation. A force gauge measures the applied compressive force, and a dial gauge records lateral deflection of the bar. Test bars of different materials and cross-sections are supplied: three steel bars (600 x 20 x 4 mm), two aluminium bars (600 x 25 x 6 mm), one aluminium circular bar (600 x 10 mm diameter), and one aluminium bar (600 x 15 x 2 mm). The effect of additional shear forces on buckling behaviour is demonstrated through a separate experiment in which a cable and weight apply a shear force at a joint along the buckling bar. This buckling of bars unit enables calculation of expected buckling forces using Euler’s buckling formula and graphical analysis of deflection against force. All components are organised in a storage system (1170 x 480 x 178 mm) with an approximate total weight of 30 kg. The complete experimental setup is housed in the structures test frame mounting frame.
Buckling of Bars FortiTestX-44, Technical Specifications
| Parameter | Detail |
|---|---|
| Model Reference | FortiTestX-44 |
| Category | Strength of Materials and Structures |
| Mounting Frame | Structure Test Frame |
| Test Bar Materials | Steel and Aluminium |
| Support Conditions | Pinned or fixed at both ends |
| Load Application | Load mechanism for compressive force |
| Force Measurement Range | Up to +5 kN |
| Lateral Deflection Range | 0 to 10 mm |
| Dial Gauge Graduation | 0.01 mm |
| Dial Gauges Included | 2 |
| Shear Force Generation | Cable, pulley, and staggered weights |
| Storage System Dimensions | 1170 x 480 x 178 mm |
| Total Approximate Weight | 30 kg |
Technical Data
Test Bars
| Bar | Dimensions |
|---|---|
| Steel bar 1, 2, 3 (x3) | 600 x 20 x 4 mm (L x W x H) |
| Aluminium bar 1, 2 (x2) | 600 x 25 x 6 mm (L x W x H) |
| Aluminium circular bar (x1) | 600 x 10 mm (L x diameter) |
| Aluminium bar (x1) | 600 x 15 x 2 mm (L x W x H) |
Measuring Ranges
| Parameter | Value |
|---|---|
| Force Range | Up to +5 kN |
| Travel Range | 0 to 10 mm |
| Dial Gauge Graduation | 0.01 mm |
Weight Set
| Weight | Quantity |
|---|---|
| 2.5 N hanger weight | 1 |
| 5 N weights | 3 |
Storage System
| Parameter | Value |
|---|---|
| Dimensions | 1170 x 480 x 178 mm |
| Total Approximate Weight | 30 kg |
Key Features
- Test Bar Materials: steel (600 x 20 x 4 mm, x3) and aluminium in three cross-sections for systematic buckling comparison
- Support Conditions: test bars pinned or fixed at both ends to replicate different Euler buckling cases
- Compressive Loading: dedicated load mechanism applies controlled compressive force to the bar
- Force Measurement: force gauge, range up to +5 kN
- Lateral Deflection Measurement: 2 dial gauges, 0 to 10 mm range, 0.01 mm graduation
- Shear Force Experiment: cable and pulley system with staggered weights applies shear force at bar joint on this buckling of bars apparatus
- Euler’s Theory Verification: experimental buckling force compared against Euler’s formula predictions
- Graphical Analysis: deflection plotted against applied force for visual buckling characterisation
- Storage System: all parts organised in a 1170 x 480 x 178 mm storage unit, total weight approximately 30 kg
- Mounting Frame: complete experimental setup housed in SM-1400F mounting frame
Experiments
- Investigation of buckling behaviour under different support and clamp conditions
- Investigation of buckling behaviour under different cross-sections
- Investigation of buckling behaviour under different materials
- Investigation of buckling behaviour under additional shear forces
- Testing Euler’s theory: buckling on elastic bars
- Measurement of force and displacement
- Calculation of expected buckling force using Euler’s buckling formula
- Graphical analysis of deflection and force
Construction and Design
The Buckling of Bars FortiTestX-44 is assembled within the SM-1400F mounting frame, which houses the load mechanism, support fixtures, measurement devices, and all test bars. Seven test bars are supplied across two materials: three steel bars at 600 x 20 x 4 mm, two aluminium bars at 600 x 25 x 6 mm, one aluminium circular bar at 600 x 10 mm diameter, and one aluminium bar at 600 x 15 x 2 mm. Each bar can be pinned or fixed at both ends to replicate the four standard Euler buckling conditions. A compressive force is applied along the bar’s long axis through the load mechanism, and measured by a force gauge with a range of up to +5 kN. Two dial gauges measure lateral deflection over a 0 to 10 mm range at 0.01 mm graduation. A separate shear force experiment uses a cable routed over a pulley with a staggered weight set to apply a lateral force at a joint on the buckling bar. This buckling of bars apparatus stores all components in a dedicated storage system measuring 1170 x 480 x 178 mm, with a total approximate weight of 30 kg.
Scope of Delivery
- 1 load mechanism
- 1 set of test bars
- 1 support
- 2 dial gauges
- 1 cable
- 1 pulley
- 1 set of weights
Q1: What materials and cross-sections are available for the test bars in the Buckling of Bars FortiTestX-44?
Seven test bars are included: three steel bars (600 x 20 x 4 mm), two aluminium bars (600 x 25 x 6 mm), one aluminium circular bar (600 x 10 mm diameter), and one aluminium bar (600 x 15 x 2 mm).
Q2: How are different buckling conditions replicated on this buckling of bars apparatus?
Each test bar can be pinned or fixed at both ends using the supplied support and clamping fixtures, enabling investigation of different Euler buckling cases within the same unit.
Q3: How is the additional shear force experiment conducted?
A cable routed over a pulley applies a lateral shear force to a joint on the buckling bar using a staggered set of weights, demonstrating the influence of shear forces on buckling behaviour.
Q4: What force and deflection ranges are available?
The force gauge measures up to +5 kN. The two dial gauges measure lateral deflection from 0 to 10 mm at 0.01 mm graduation.
Q5: What mounting frame is required for the FortiTestX-44?
The complete experimental setup is housed in the SM-1400F mounting frame, which is used to contain the load mechanism, bars, supports, and measurement instruments.
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