038141 Sample TubeThrough the combination of "precise temperature control environment, multi-dimensional deformation monitoring, and standardized testing process", the thermal deformation test was successfully passed to ensure the structural stability and safety of use under high temperature conditions. The specific implementation path is as follows:

1、 Clearly define testing standards and core indicators

The testing strictly follows international common thermal deformation testing standards such as ASTM D648 and ISO 75, and sets core parameters for the application scenarios of 038141 sample tubes (such as high-temperature sample storage and thermal analysis experiments). The test temperature range covers the actual usage range and extreme working conditions (usually -20 ℃~200 ℃, and the critical range is 50 ℃~150 ℃ for intensive testing), with a load set at 0.45MPa (simulating the actual force on the sample tube after containing the sample), and the test time is 30 minutes of constant temperature at each temperature point to fully capture the thermal deformation law. The core qualified indicators are: within the rated operating temperature range, the thermal deformation is ≤ 0.2mm/m, and there is no structural failure such as warping, cracking, leakage, etc.

2、 Building a precise and controllable temperature control testing environment

Using a professional thermal deformation testing chamber to build a testing environment, ensuring temperature uniformity and stability. The test box is equipped with a high-precision heating/cooling module, with a temperature control accuracy of ± 0.5 ℃ and a temperature uniformity of ≤± 1 ℃ inside the box, avoiding testing errors caused by local temperature differences. Translate into English038141 Sample TubeFixed in a dedicated fixture, ensuring that the pipe is subjected to vertical force without additional stress interference, while reserving space for pipe expansion and contraction to prevent false deformation caused by fixture constraints. In response to the sealing characteristics of the sample tube, some testing scenarios use inert gas protection (such as nitrogen atmosphere) to avoid the oxidation of the tube material at high temperatures affecting the test results.

3、 Multi dimensional deformation monitoring, accurately capturing data

Adopting a "contact+non-contact" composite monitoring method to comprehensively capture thermal deformation data. Contact monitoring uses high-precision displacement sensors (with an accuracy of 0.001mm) to attach key points at both ends and the middle of the sample tube, recording real-time changes in axial and radial length; Non contact monitoring uses a laser rangefinder to scan the surface of the tube, generate a three-dimensional deformation profile, and identify whether there are irregular deformations such as local protrusions and depressions. During the testing process, the data acquisition system records the temperature and deformation every 10 seconds, automatically generating a "temperature deformation" relationship curve to visually present the deformation trend at different temperatures, making it easier to determine the critical deformation temperature.

4、 Step by step testing and failure verification to ensure reliable results

The testing is conducted in stages to ensure the comprehensiveness of the results. The first stage is the temperature rise test, gradually increasing from room temperature to the maximum temperature, keeping the temperature constant for 30 minutes every 20 ℃, and recording deformation data; The second stage is a constant temperature durability test, which involves continuous insulation for 24 hours at the upper limit of the rated operating temperature to monitor whether the deformation tends to stabilize and there is no risk of continuous deformation; The third stage is the cooling cycle test, which repeats the "heating constant temperature cooling" cycle three times to verify the thermal fatigue resistance of the tube body and avoid structural damage caused by repeated temperature changes. After the test is completed, the sample tube is subjected to airtightness testing and visual inspection to confirm that there is no structural failure, and the final judgment is whether it has passed the thermal deformation test.