KR-20260062316-A - Material testing apparatus and material testing method

KR20260062316AKR 20260062316 AKR20260062316 AKR 20260062316AKR-20260062316-A

Abstract

The present invention provides a material testing apparatus and a material testing method, and may include a chamber that accommodates a specimen in an internal space, a test jig that supports the specimen in the internal space and applies heat or external force to the specimen, a refrigerant injection module that injects a refrigerant into the internal space of the chamber, and a controller that controls at least one of the test jig and the refrigerant injection module to evaluate the fatigue behavior of the specimen according to a temperature change.

Inventors

이창민
이재희

Assignees

에이치디한국조선해양 주식회사
에이치디현대중공업 주식회사
에이치디현대삼호 주식회사

Dates

Publication Date: 20260507
Application Date: 20241029

Claims (10)

A chamber for accommodating a specimen in an internal space; A test jig that supports the specimen in the internal space and applies heat or external force to the specimen; A refrigerant injection module for injecting refrigerant into the internal space of the chamber; and A material testing apparatus comprising: a controller that controls at least one of the test jig and the refrigerant injection module to evaluate the fatigue behavior of the specimen according to temperature changes.
In Article 1, The above controller is, A material testing device that controls at least one of the above test jig and the above refrigerant injection module to simulate thermal history on the specimen and then applies an external force.
In Article 1, The above controller is, A material testing device that, based on input data regarding the thermal history and test conditions of the above specimen, heats the specimen to a first temperature and then cools it to a second temperature.
In Paragraph 3, The above controller is, A material testing device that applies an external force to the specimen cooled to the second temperature and then cools the specimen to a third temperature lower than the second temperature.
In Article 1, The above controller is, A material testing device that determines a target cooling temperature and a target cooling rate of a specimen based on input data regarding the thermal history and test conditions of the specimen, and determines whether to spray the refrigerant in the refrigerant injection module.
In Article 5, The above controller is, A material testing device that determines the amount of refrigerant injected according to the target cooling rate of the above specimen.
In Article 5, The above controller is, A material testing device that controls the amount of refrigerant injected when the actual cooling rate of the above specimen deviates from a preset range of the above target cooling rate.
A step of supporting a specimen on a test jig placed in the internal space of a chamber; A step of changing the temperature of the specimen and applying an external force based on input data regarding the thermal history and test conditions of the specimen; and A material testing method comprising the step of evaluating the fatigue behavior of the above specimen according to temperature change.
In Article 8, The step of changing the temperature and applying an external force is, A step in which the test jig transfers heat to the specimen to heat the specimen to a first temperature; A step of cooling the specimen heated to the first temperature to the second temperature; A step of applying an external force by the test jig to the specimen cooled to the second temperature; and A material testing method comprising the step of cooling the specimen to which the above external force is applied to a third temperature lower than the second temperature.
In Article 8, The step of changing the temperature and applying an external force is, A material testing method for determining whether to inject a refrigerant and the amount to inject into the internal space of the chamber based on the target cooling temperature and target cooling rate of the above specimen.

Description

Material testing apparatus and material testing method The present invention relates to a material testing apparatus and a material testing method. Storage tanks of ships that store and transport cryogenic liquefied gases, such as LNG or LPG, must be insulated from the outside to maintain the contained liquefied gas in a desired state, while also possessing durability against the load and chemical action of the liquefied gas. In addition, for steel materials exposed to such cryogenic environments, verification of structural suitability due to cracking is required. In particular, steel can be exposed to low-temperature environments after being subjected to heat-affected processes such as welding, and research and development regarding the behavior of the heat-affected zone (HAZ) in such situations are continuously being conducted. Conventionally, thermal history is simulated in the material, specimens are taken from the area expected to be the HAZ, and material properties are evaluated in a separate low-temperature environment. FIG. 1 is a schematic diagram showing a material testing apparatus according to one embodiment of the present invention. FIGS. 2 and FIGS. 3 are drawings illustrating an exemplary configuration of a material testing device of FIG. 1. Figure 4 is a configuration diagram illustrating the controller of Figure 1. FIGS. 5 to 7 are flowcharts illustrating a material testing method according to an embodiment of the present invention. The structure and operation of the present invention will be described in detail below with reference to embodiments of the present invention illustrated in the attached drawings. The present invention is capable of various modifications and may have various embodiments; specific embodiments are illustrated in the drawings and described in detail in the detailed description. The effects and features of the present invention, and the methods for achieving them, will become clear by referring to the embodiments described below in detail together with the drawings. However, the present invention is not limited to the embodiments disclosed below but can be implemented in various forms. Hereinafter, embodiments of the present invention will be described in detail with reference to the attached drawings. When describing with reference to the drawings, identical or corresponding components are given the same reference numerals, and redundant descriptions thereof will be omitted. In the following examples, singular expressions include plural expressions unless the context clearly indicates otherwise. In the following embodiments, terms such as "include" or "have" mean that the features or components described in the specification are present, and do not preclude the possibility that one or more other features or components may be added. Where an embodiment can be implemented differently, a specific process sequence may be performed differently from the order described. For example, two processes described consecutively may be performed substantially simultaneously or proceed in the reverse order of the description. In the drawings, the size of components may be exaggerated or reduced for convenience of explanation. For example, the size and thickness of each component shown in the drawings are depicted arbitrarily for convenience of explanation, so the following embodiments are not necessarily limited to those illustrated. FIG. 1 is a schematic diagram showing a material testing device (1) according to one embodiment of the present invention, and FIG. 2 and FIG. 3 are diagrams showing an exemplary configuration of a part of the material testing device (1) of FIG. 1. Referring to FIGS. 1 to 3, the material testing device (1) may be equipped with a chamber (100), a test jig (200), a refrigerant injection module (300), a sensor unit (400), and a controller (500). The chamber (100) can accommodate a specimen (TP). A test jig (200) may be placed in the chamber (100), and the specimen (TP) may be mounted on the test jig (200) and accommodated inside the chamber (100). The chamber (100) may have a chamber wall (110). The chamber wall (110) may form a sealed internal space (SP), and a specimen (TP) may be placed in the internal space (SP). The chamber wall (110) may be made of an insulating material. Thermal history is simulated in the internal space (SP) of the chamber (100) for the specimen (TP), and an environment may be formed in which the specimen (TP), which is subject to fatigue behavior evaluation, is exposed. Accordingly, the material testing device (1) is equipped with a chamber wall (110) made of an insulating material to improve the temperature maintenance performance of the chamber (100) and to obtain reliable evaluation data. For example, the chamber wall (110) may include glass bubble, EPP (Expanded Polypropylene), EPS (Expanded Polystyrene), etc. The material of the chamber wall (110) is not particularly limited and may be any kind of material that can effective