²é¿´: 1417  |  »Ø¸´: 6
¡¾ÐüÉͽð±Ò¡¿»Ø´ð±¾ÌûÎÊÌ⣬×÷Õßbeyond1987½«ÔùËÍÄú 5 ¸ö½ð±Ò
µ±Ç°Ö»ÏÔʾÂú×ãÖ¸¶¨Ìõ¼þµÄ»ØÌû£¬µã»÷ÕâÀï²é¿´±¾»°ÌâµÄËùÓлØÌû

beyond1987

Ìú³æ (³õÈëÎÄ̳)

[ÇóÖú] ľ²ÄµÄÓ¦Á¦Ó¦±ä¹ØϵÊÇÔõÑùµÄѽ£¿ÒÑÓÐ1È˲ÎÓë

´ó¼ÒÓÐÖªµÀµÄô£¿
ÎÒÕÒÁ˸÷ÖÖÊé¼®ºÍÎÄÏ×£¬¶¼Ã»Óп´µ½Óн²Ä¾²Ä±¾¹¹¹ØϵµÄ¡£ÓÐûÓÐÈËÓÐÕâ·½ÃæµÄ×ÊÁÏ»òÎÄÏ×ʲôµÄô£¿ÓеĻ°·¢¸øÎÒÒ»·Ý°É£¬¸Ð¼¤²»¾¡~
»Ø¸´´ËÂ¥

» ²ÂÄãϲ»¶

» ±¾Ö÷ÌâÏà¹Ø¼ÛÖµÌùÍƼö£¬¶ÔÄúͬÑùÓаïÖú:

ºÇºÇ~
ÒÑÔÄ   »Ø¸´´ËÂ¥   ¹Ø×¢TA ¸øTA·¢ÏûÏ¢ ËÍTAºì»¨ TAµÄ»ØÌû

ehe333333

ľ³æ (ÖøÃûдÊÖ)

ÕÒµ½Ò»¸ö±ðÈ˵ÄʵÑé¡£×Ô¼º¿´¿´°É¡£


Materials testing laboratories determine wood strength and stiffness in a standard static-bending test where the test specimen's resistance to slowly applied loads is measured. The standard tests are generally conducted at 12% moisture content and 20¡ã C temperature. The ends of the test specimen are supported on rollers, usually with growth rings horizontal, and a load is applied at the beam centre so that a constant rate of deflection is maintained until the piece fractures. Instruments measure and plots the load (stress) and the deflection (strain) at intervals, as shown in the diagram. The vertical axis reflects the increasing stress and the horizontal axis the increasing strain.

The first part of the curve is a straight line where the deflection is directly proportional to the load and where, once the load is removed, the beam will return to its original state; i.e. it retains its elasticity. With increasing load, a limit point of proportionality is reached after which the increase in amount of deflection is greater than (i.e. no longer proportional with) the increase in load; but elasticity is still retained until an elastic limit is reached. If stress is further increased, the material loses elasticity and becomes plastic (i.e when the load is removed the deformation caused by deflection will be more or less permanent). At the point of maximum load, ultimate load or ultimate strength, the material begins to yield and will fracture unless load is substantially reduced.

stress_strain.gif

3Â¥2013-02-08 17:20:17
ÒÑÔÄ   »Ø¸´´ËÂ¥   ¹Ø×¢TA ¸øTA·¢ÏûÏ¢ ËÍTAºì»¨ TAµÄ»ØÌû
²é¿´È«²¿ 7 ¸ö»Ø´ð

Ò»ÌõСÊé³æ

Ìú¸Ëľ³æ (ÖªÃû×÷¼Ò)

¡¾´ð°¸¡¿Ó¦Öú»ØÌû

¸Ðл²ÎÓ룬ӦÖúÖ¸Êý +1
ÌìȻľ²ÄºÜÉÙÓÐÕâ¸ö¹Øϵ£¬ÒòΪÉÔÉÔÒ»À­¡¢Ñ¹¾Í¿ªÁÑ£¬²ÄÖʺÜÄÑÂú×ã¸÷ÏòͬÐÔ¼Ù¶¨£¬¸ü±ðÌá?ŽËÜÐÔ¼Ù¶¨µÈ¡£
¸´ºÏľÁÏ£¬ÓÐÕâÖÖ¹Øϵ£¬Â¥Ö÷ÊÇ·ñÔÚ×öÕâ¸öÑо¿£¿
2Â¥2013-02-06 09:24:16
ÒÑÔÄ   »Ø¸´´ËÂ¥   ¹Ø×¢TA ¸øTA·¢ÏûÏ¢ ËÍTAºì»¨ TAµÄ»ØÌû

ÊÖÖеÄɳ

½ð³æ (СÓÐÃûÆø)

¡¾´ð°¸¡¿Ó¦Öú»ØÌû

¡¶Ä¾ÖÊ×ÊÔ´²ÄÁÏѧ¡· »òÕ߸÷ÖÖ°æ±¾µÄ¡¶Ä¾²Äѧ¡·¶¼»áÓнÏΪÏêϸµÄ½éÉܵġ­¶øÇÒÕâÀàÎÄÏײ»ÊÇÒ»ËÑÒ»´ó°ÑÂð¡­

[ ·¢×ÔÊÖ»ú°æ http://muchong.com/3g ]
4Â¥2013-02-16 11:56:12
ÒÑÔÄ   »Ø¸´´ËÂ¥   ¹Ø×¢TA ¸øTA·¢ÏûÏ¢ ËÍTAºì»¨ TAµÄ»ØÌû

ÄäÃû

Óû§×¢Ïú (СÓÐÃûÆø)

±¾Ìû½öÂ¥Ö÷¿É¼û
5Â¥2013-03-07 09:43:40
ÒÑÔÄ   ÉêÇëÅ©ÁÖEPI   »Ø¸´´ËÂ¥   ±à¼­   ²é¿´ÎÒµÄÖ÷Ò³
²»Ó¦Öú È·¶¨»ØÌûÓ¦Öú (×¢Ò⣺ӦÖú²Å¿ÉÄܱ»½±Àø£¬µ«²»ÔÊÐí¹àË®£¬±ØÐëÌîд15¸ö×Ö·ûÒÔÉÏ)
×î¾ßÈËÆøÈÈÌûÍƼö [²é¿´È«²¿] ×÷Õß »Ø/¿´ ×îºó·¢±í
[½Ìʦ֮¼Ò] ¸ßУ´ÇÖ°£¬ÒªÇóÅâ³¥£¬Õâµ½µ×ºÏ²»ºÏÀí +20 ´«¶¯_º£Éñ 2024-06-23 28/1400 2024-06-24 19:49 by ´«¶¯_º£Éñ
[»ù½ðÉêÇë] ²©ºóÃæÉϽñÌìÏÂÎç»á¹«²¼Âð£¿ÓÐÎÞÏûÏ¢£¿ +18 hajkdfdf 2024-06-24 23/1150 2024-06-24 19:32 by wangdachui0
[¿¼²©] ¶ÔÏóûÓУ¬»¹·Ç³£Ïë¶Á²©£¬ÄÑÒÔ¾ñÔñ +18 pvrw0224 2024-06-23 40/2000 2024-06-24 19:22 by tjushede
[˶²©¼ÒÔ°] »Ø¼ÒÁ½Ì죬²»Ïë´ôÁË +4 368ghnf 2024-06-22 8/400 2024-06-24 19:03 by ÎÒÊÇÍõС˧
[»ù½ðÉêÇë] ÆÀÉóר¼Ò»á²»»áºÜÔÚÒâÉêÇëÈ˵ĵ¥Î»°¡ +7 lancet0903 2024-06-24 7/350 2024-06-24 17:23 by LNP@mRNA
[¿¼²©] ¹ØÓÚ¶Á²©¸Ð¾õ×Ô¼ººÜ×¥Âí +12 С¾ÅÔ 2024-06-19 18/900 2024-06-24 16:06 by С¾ÅÔÂ
[½Ìʦ֮¼Ò] ÊÔÓÃÆÚ´ÇÖ° +12 ZHONGWU_U 2024-06-18 23/1150 2024-06-24 15:40 by fenda
[»ù½ðÉêÇë] Ìü¼¶ÏîÄ¿³öУȴûÖÐ +10 Iwould 2024-06-23 17/850 2024-06-24 12:11 by ½ø»÷µÄÈÙÒ«
[»ù½ðÉêÇë] ¹ú×ÔÈ»×ÊÖú±ÈÂÊÊDz»ÊÇҪϽµÁË£¿£¿ +8 ½ñÍíÍƼö22 2024-06-21 12/600 2024-06-24 11:15 by Pickfoot
[´ß»¯] ÇóÖúԭλºìÍâ +3 jfdhj 2024-06-21 7/350 2024-06-24 10:52 by qvhm2609
[»ù½ðÉêÇë] ²©ºóÃæÉϺÍÌØÖú½ñÌì³öÂ𣿠+41 ¶ºÄúÍæ 2024-06-21 77/3850 2024-06-24 09:47 by weichuny
[»ù½ðÉêÇë] ½­ËÕÊ¡333È˲Ź¤³Ì ³öУºó±»Ë¢µÄ¸ÅÂÊ´ó²»´ó£¿ +8 maxbirdzhang 2024-06-19 12/600 2024-06-23 20:39 by ²éÀ­Í¼Ë¹ÌØÀ­
[ÂÛÎÄͶ¸å] OSAÆÚ¿¯Éó¸åÓâÆÚ +3 Thomas_Squid 2024-06-22 3/150 2024-06-23 15:20 by wspglt
[»ù½ðÉêÇë] ÑÝÔ±ÑîÃÝÔÚºËÐÄÆÚ¿¯·¢±íÂÛÎÄ£¬Öйú¹ã²¥µçÊÓѧÆÚ¿¯ +8 babu2015 2024-06-22 11/550 2024-06-23 11:49 by jurkat.1640
[»ù½ðÉêÇë] ÃæÉϲ©Ê¿ºó +11 jsqy 2024-06-19 13/650 2024-06-21 17:12 by sizhouyi
[ÂÛÎÄͶ¸å] ACS ±à¼­µÄÒâ¼û 10+3 ¹þ¹þæ¤1993 2024-06-20 3/150 2024-06-21 17:06 by Ͷ¸öÂÛÎÄ
[Óлú½»Á÷] ÅÜ°åÄÜÅÜ¿ª£¬¹ýÖù¹ý²»´¿Ôõô°ì +8 СºúÔÚŬÁ¦ 2024-06-18 10/500 2024-06-21 08:22 by hptianyan
[ÂÛÎÄͶ¸å] µÚһƪÂÛÎÄͶ¸å½ø³Ì¼Ç¼ +4 É÷¶ÀµÄС»¨¾í 2024-06-20 9/450 2024-06-20 20:37 by É÷¶ÀµÄС»¨¾í
[»ù½ðÉêÇë] ÃæÇàµØ»áÆÀʱ¼ä£¿£¿£¿ +7 Axvdvbfs 2024-06-19 8/400 2024-06-20 11:16 by ·ң»¹ÓÐË­
[º£Íⲩºó] Ä«¶û±¾´óѧ²©ºóofferÒª²»Òª½Ó +3 kyxblmm 2024-06-18 3/150 2024-06-19 22:39 by blake1111
ÐÅÏ¢Ìáʾ
ÇëÌî´¦ÀíÒâ¼û