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US 9,823,159 B2Granted
Low cycle fatigue testing
AssigneeDmar Engineering, Inc.
InventorsZhiming Huang, Dagang Zhang
Life of this patent
Estimating the term…
Abstract
Apparatus and methods related to low cycle fatigue testing are described. For example, some embodiments may contain a control box, two fitting connections, a pressure gauge, a plurality of clamps, a plurality of hydraulic cylinders, a plurality of control cables, and a strain gauge, for testing the low cycle fatigue properties of a testing specimen, for example, a steel tube umbilical.
Claims20
An apparatus for low cycle fatigue testing on a testing specimen, comprising:
- a testing platform;
- a plurality of hydraulic cylinders arranged along a length of the testing platform, the hydraulic cylinders extending and retracting along parallel axes of the plurality of hydraulic cylinders that are displaced from each other;
- a plurality of clamps positioned along a length of the testing specimen, each clamp being connected to a respective one of the plurality of hydraulic cylinders;
- a strain gauge attached to an outer surface of the testing specimen;
- a plurality of control cables and a signal cable;
- and
- a control box connected by the plurality of control cables to the plurality of hydraulic cylinders and by the signal cable to the strain gauge, wherein the control box performs the low cycle fatigue testing by analyzing data from the strain gauge.
4 more elements
A method for low cycle fatigue testing on a testing specimen, comprising:
- attaching a strain gauge to an area on a surface of the testing specimen;
- connecting the strain gauge to a control box via a signal cable;
- attaching a plurality of clamps along a length of the testing specimen;
- attaching the clamps to a plurality of hydraulic cylinders, the plurality of hydraulic cylinders being oriented to extend and retract along parallel axes of the plurality of hydraulic cylinders that are displaced from each other;
- connecting the plurality of hydraulic cylinders to the control box via a plurality of control cables;
- and
- operating the control box to (1) send signals to the plurality of hydraulic cylinders to bend the testing specimen and (2) receive strain gauge reading from the strain gauge wherein the control box performs the low cycle fatigue testing by analyzing data from the strain gauge.
4 more elements
Dependencies are inferred from the claim text.