MIL-STD-810G高温試験 - 気候チャンバー

The MIL-STD-810G test method was developed specifically for dod applications, but can also be customized for commercial applications and includes a variety of environmental tests, including: Low Pressure (Altitude) ,High Temperature,Low Temperature,Temperature Shock,Salt Fog ,Sand and Dust,Vibration,shock, this article is mainly about High temperature test 501.5 in MIL-STD-810G test method

目的

The MIL-STD 810G high temperature test helps to assess the impact of high temperature conditions on performance, integrity and material safety. This method is best suited for materials that may be used at temperatures higher than standard ambient temperatures. According to the MIL-810H high temperature regulation, all tests shall be performed in a high temperature test chamber.

アプリケーション

Use this method to evaluate materials that may be deployed in areas where the temperature (ambient or induced temperature) is higher than the standard ambient temperature.

拘束

1. Evaluate the time-dependent performance degradation (aging) effects that occur during sustained long-term exposure to high temperatures (in storage or operating mode), where synergistic effects may be involved. For such a high temperature aging effect, it is tested in a natural environment.
2. Evaluate materials in high temperature environments where solar radiation creates a significant thermal gradient in the material. To simulate a direct solar impact, use Method 505.5, step 1.
3.Evaluating actinic (photochemical) effects (use Method 505.5, Procedure II).
4.Evaluating the effects of aerodynamic heating.
5. While high-temperature testing of munitions may be considered, safety or hazard tests should be performed in accordance with MIL-STD-2105C(para. 6.1, ref. 6.1D)

気候条件。

Determine the appropriate climatic conditions for the geographical area in which materials are handled and stored. There are usually two types of high temperatures: dry heat and alkaline heat. Data for these areas are shown in Tables 501.5-1, -2 and -3. Determine high temperature levels related to:
1.Climatic area of concern.
2. Solar radiation exposure: Is it directly exposed to materials, containers, shields, etc.?
3. Heat transfer path analysis from ambient air and solar radiation to materials.

表501.5-I.高温日周期範囲の要約
デザインの種類	場所	周囲空気 °C	誘導°C
ベーシックホット(A2)	世界の多くの地域、外側に広がっています 南西部のホットドライカテゴリーから 米国、メキシコ北西部、中央部、 西オーストラリア、サハラ アフリカ、南 アメリカ、スペイン南部、南西部、 中央アジア南部。	30-43 (86-110	30-63 (86-145)
ホットドライ(Al)	南西および南中央アジア、南西 米国、サハラ・アフリカ、中央部、 オーストラリア西部、メキシコ北西部	32-49 (90-120)	33-71 (91-160)

温度と湿度の日周期を表501.5-IIおよび-IIIに示します。 誘発条件とは、極端な保管または輸送中に材料がさらされる可能性のある気温レベル、または非稼働であるがコンテナ化されていない運用構成の空気温度レベルです。 1.これらのサイクルは、1979年8月1日のAR 70-38(パラグラフ6.1、参照cを参照)から取得され、基本的にMIL-HDBK-310およびNATO STANAG 4370、AECTP 200(パラグラフ6.1、参照aおよびb)のサイクルに準拠しています。これらの値は、この気候カテゴリの典型的な一日の典型的な状態を表します。「誘発条件」とは、太陽光負荷によって悪化する保管または輸送状況、または非動作状況中に、コンテナ化されていない運用構成で材料がさらされる可能性のある気温レベルです。 2.高温試験時の湿度管理は一般的に必要ありません。これらの値は、たとえば、高レベルの温度と湿度が同時に発生することがわかっている特別な場合にのみ使用してください。 3.データはもともと°Fで記録され、°Cに変換されました。 そのため、テーブル データの変換に一貫性がない可能性があります。

ばく露時間。

Determine the exposure time the material will experience under each of the identified exposure conditions. The exposure can be constant or cyclic, in which case it is also necessary to determine the number of times the exposure occurs.
 

恒温暴露

For thermostatic exposure (used only for items near heating equipment or when the operation of the item needs to be verified at a specified constant temperature), soak the test item until its temperature is stable and maintain the test temperature for at least two hours after the test item is stable.
 

繰り返しの温度暴露

For cyclic exposure, the test duration is determined based on an estimate of the number of cycles required to meet the design requirements and the guidelines below. The duration of heat exposure may be as important as the temperature itself. Because procedures I and II may expose the test item to cycle temperatures, the number of cycles is critical. (The cycle is 24 hours unless otherwise stated.)
 

1. 手順I-ストレージ。

The number of cycles of storage tests is set to at least seven times to be consistent with the 1% frequency of extreme temperature hours in the worst months of the year on average in the worst locations. (The maximum temperature per cycle is about an hour.) When considering extended storage time, critical materials or materials that are very sensitive to high temperatures, increase the number of cycles to ensure that design requirements are met.
 

2. 手順II-操作。

The minimum number of cycles of the operational exposure test is three. This number is usually sufficient for the test item to reach its maximum response temperature. When a repeated temperature response is difficult to obtain, a maximum of 7 cycles is recommended.

Multiple versions of the high temperature test procedure have been available for MIL-STD-810 high temperature test. Below is a list of each version and the corresponding method number
MIL-STD-810A試験方法501.1高温試験 MIL-STD-810B試験方法501高温試験 MIL-STD-810C試験方法501.1高温試験 MIL-STD-810D試験方法501.2高温試験 MIL-STD-810E試験方法501.3高温試験 MIL-STD-810F試験方法501.4高温試験 MIL-STD-810G試験方法501.5高温試験 MIL-STD-810H試験方法501.7高温試験
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