In view of bearing capacity of the elastoplastic theory analysis, the author made a comparison between the achieved bearing capacity limit load pi / 4 of round base ( space problem ) and the limit load pi / 4 of bar groundwork foundation design ( plane problem ) from soil mechanics at home and abroad as well as foundation criterion, and explained why the value of formula in present design criterion from soil mechanics is inclined to be conservative. in the light of the author ' s many years experience of vibration test on the spot and the research work of relevant projects, the author worked over the dynamic pile testing of the bearing capacity of foundation and batholith, and gathered the parameter of dynamic analysis and testing. the author also talked over the difficult point of pile foundation design criteria in present batholith engineering world, i. e. the confirmation of batholith bearing capacity of pile end, from the following aspects : a ) confirmation of single axis counter - pressure strength of rock in house ; b ) f. e. m calculation of elastoplastic model ; c ) calculation of soil mechanics ; d ) deep well load test
然後,對巖土工程領域至今尚未解決,甚至不為人注意的考慮地基
變形的地基承載力問題進行了實用化的探討,提出了考慮地基
變形的地基承載力上程計算方法;對基於彈
塑性理論分析的地基承載力國內尚未見報道的空間問題得到了圓形基礎(空間問題)的承載力界限荷載p _ ( 1 / 4 ) ,並與國內外土力學專著及地基基礎設計規范中的條形基礎(平面問題)的界限荷載p _ ( 1 / 4 ) ,進行了對比,從而定量上解釋了目前設計規范引用土力學承載力公式值偏於保守的這一情況;根據本文作者多年從事現場地基工程振動試驗及相關課題的研究工作,本文以截頭錐模型模擬地基,對地基(巖基)承載力的動測法進行了研究,為各類地基(包括巖基) ,匯總了動力分析和檢測川的參數:針對日前巖土工程界應用樁基設計規范中的難點? ?樁端巖基承載力的確定問題,從巖石室內單軸抗壓強度確定、基於彈
塑性模型的有限單元法計算、土力學計算及深斤載荷試驗四方面進行了深入討論;本文作者根據多年現場載荷試驗的工程實踐,對深井荷試驗裝置的核心部分? ?反力裝置,設計了側壁支撐反力加載系統,該加載系統具有實用、簡便、穩定及安個等優點。
Excessive imperfections even sub - grained boundaries may be introduced in cementite. this makes the accelerating dissolution and spheroidization of cementite easy. 5
由於滲碳體的強烈
塑性
變形,在其內部導入了大量的晶體缺陷甚至亞晶界。
3. on the present deformation condition, the cementite in pearlitic steel has more severe plastic deformation capability t - he max shear strain up to 1. 9. 4
C方式ecap
變形條件使珠光體鋼65mn中的滲碳體可以表現出很強的
塑性
變形能力? ?觀察到的最大切
變形達到1 . 9的等效真應
變。
When the specimens are deformed in a long time at the optimal superplastic deformation condition, the microstructure is coarsened sharply. if the deformation time is shortened properly or the deformation temperature is decreased appropriately or strain rate is increased, homogeneous and fine equiaxed crystal microstructure can be obtained
在最佳超
塑性條件下長時間
變形時,合金顯微組織將發生明顯粗化,適當縮短
變形時間、或適當降低超
塑變形溫度及提高應
變速率,可得到均勻細小的等軸組織。
The anti - wearing property of chme steel is 15 percent to 35percent higher than zgmnl3, which is a widely used anti - wearing steel. the reason of the excellent mechanical properties and anti - wearing property of chme steel is that the heat treatment sturcture of chme steel is composed of tempered martensite, bainite, temper troostite, remaining austenite and carbonide
磨面分析表明, chme鋼基體高強度,高硬度、良好的強韌性配合和碳化物硬質點的彌散分佈,磨痕細短淺小,擠
塑變形區細小均勻,抵抗沖擊滑動累積
塑性疲勞能力強,是其耐磨性比zgmn13高的原因。
The results show that with the increase of loads, the mass loss of roller increases considerably, with the increase of roller ' s hardness, the main wear mechanism changes from plastic deformation wear to ploughing wear
結果表明,隨著外加載荷的增大,輪子磨損加劇,隨著輪子硬度增加,主要磨損機理從
塑變磨損轉
變為犁溝磨損。
The microscopic plastic deformation of the local crazes cause the change of crack opening loads. therefore, the fatigue crack closure concept could be introduced. a crack closure model of mdyb - 3 pmma were recommended and phenomenologically formulated for positive and negative stress ratios separately, according to the testing results of fatigue crack propagation
本文討論了有機玻璃疲勞裂紋擴展機理,提出,銀紋的形成是裂紋形成和擴展的基礎,從微觀上解釋了裂紋形成和擴展的原因,並結合金相分析結果,明確提出
塑變誘導閉合和粗糙誘導閉合是有機玻璃疲勞裂紋面閉合的兩個主要原因,成功的解析了裂紋面的閉合現象。
The partial liquid phase during superplastic deformation of 2024 aluminum alloy - matrix composites reinforced with sic particulates ( pm - sic ( subscript p ) / ly12 ) by powder metallurgical ( pm ) processing was studied usina sem etc
摘要用掃描電鏡等方法對碳化顆粒強化ly12鋁合金基復合材料超
塑變形時出現的局部液相現象進行了研究分析。
The results indicate that the elastic operating stress range of a torsional axis is extended greatly by pre - twist process and the main reason lies on surface residual stress
結果表明,預扭后扭力軸彈性工作應力?圍得到極大擴展,其主要原因在於預扭
塑變形成的表面殘餘應力。
Method for measurement of cavity volume fraction of superplastically deformed metallic materials
超
塑變形金屬材料孔穴體積比值的測量方法
Plastics - thermosetting moulding materials - determination of transfer flow
塑料.熱固性模製塑料.傳輸塑變性的測定