tu dari sudut joint 2 materials. Tapi dari sudut shape atau bentuk/form design cthnya: shape empat segi rata dengan shape piramid atau kon... ada kesan sampingan mana lebih cepat terhakis atau taburan hakisan ada pattern ke.....Dr. ada komen..
oo... bagi flat surface biasanya tiada beza. Corrosion rate hampir sama. tp bila ada defect atau large grains size pasti ada point utk corrosion to start. Untuk permukaan tajam atau sharp edges, cone, sini akan berlaku high activities. ie dendrite akan terjadi tempat paling tajam atau paling kecil. sebab itulah electrodeposition jd xrata. ini trjadi sbb sharp edges produces high potential. Harap membantu. Kalu sya xleh jawap nanti saya tanya tokguru besar saya!! (sekarang dok buat haji)
Jom sapa2 yang lalu page ni...ada experience dan buah fikiran komen2 jom...boleh tengok padangan dari pelbagai perspektif...kongsi2 idea kongsi2 cerita yuk!!!
Ya. tp tolong tanya orang lain lg, saya bukannya tau sgt. Insya Allah sya carikan rujukan.... bagus juga soalan ni utk sya improve my knowledge. thanks
saya comment ni from materials engineering point of view la ye: design of product ni ade byk effect cth nya dari segi quality, safety & economic (may be ade few more things but i can just remember this at da moment..hehe..sama2 betulkan ye kalo ade slh slp):
Quality ni termasuk la corrosion resistance. if design tu ade sharp edge ini can cause high corrosion rate due to high stress concentration. sharp edge ni weak point. jadi sharp edge will be easily corrode & tends to fail. sharp edge ni jugak akan senang patah disebabkan high stress concentration. So to avoid this design tu mestilah ade certain angle..mesti smooth & rounded corner instead of sharp edge...ade byk lagi aspect quality yg bekaitan..sila refer books la kot..yg ni specific pada corrosion kes saje..in terms of safety of coz rounded corner safer compared to sharp edges (spt yg dinyatakan diatas: mudah patah & gagal...bahaya kpd pengguna gak). in terms of economic, sharp edge require more materials to be used compared to rounded corner (cuba draw if cant imagine), so this is really important issue to engineers. safe the materials seoptimum yg mungkin while maintaining high quality product! materials=cost. kurangkan kos tingkatkan prestasi *eh cam pnh dgr dlm MELODI* hahaha :)
Ok that's all...for more info leh baca buku2 materials design, prevention to corrosion or apa2 buku yg sama waktu dgn nya...
Thanx alot ~white rose~ =) Banyak input jugak.. Kepada Dr.Azmin dan ~white rose~... - How to determine the residual stress on the workpiece of material??...and - How it affected the quality of parts?
Measurement - (1) you can use XRD to see if there have different in dhkl. you need to compare with standard sample. (2) you can see using microscope i.e. SEM, some time elongated grains represent the stress layer. Affect? unreleased stress will give many problems. Thanks
oopss sorry ye anonymous..white rose x tau pula ada question from u...ye la ni bukan blog white rose tapi blog Dr Azmin ye...hehe..
Hmm back 2 da questions...i guess Dr Azmin dah pun jawab..sy cuma nak tambah sikit je kat sini...again as Materials Engineer point of view ye (sy bukan pakar in corrosion as i'm specialized in other field..but i just share some knowledge yg ada je..Dr tlg betulkan sy kalo ada slh slp ye)...
1- to determine residual stress ni ada 2 method; destructive & non-destructive. Mechanical methods or dissection uses the release of stress and its associated strain after doing a cut, hole or crack ( ni cth destrcutive method). while XRD & neutron diffraction pula cth non-destructive & they allows measurement of residual stress in isolated spots. actually design of mechanical part 2 be tested ni penting utk kt plh samada nak guna destructive or non destructive method.
2- Of cozz the quality will be affected by residual stress...sbb commonly residual stress ni visible (distortion, bending, etc.)
pasal type of mikroskop 2 be used pula..depend on ur sample as tok guru sy dah pun jawab...sy cadangkan awak baca buku on materials selection & characterization dan juga mechanical metallurgy 4 more info...
orite...thank you ~white rose~...residual stress will give lot of problem and normally the surface with higher hardness compared to the stndard hardness of that material keeping high residual stress also but must be proven by XRD.. =)
Dr. apa effect/pengaruh design terhadap corrosion product.....?
ReplyDeletebanyak... boleh buat satu buku. ambil contoh mudah. jika kita ada dissimilar metals, jarak dekat akan corrode lagi banyak dari jauh.
ReplyDeletetu dari sudut joint 2 materials. Tapi dari sudut shape atau bentuk/form design cthnya: shape empat segi rata dengan shape piramid atau kon... ada kesan sampingan mana lebih cepat terhakis atau taburan hakisan ada pattern ke.....Dr. ada komen..
ReplyDeleteoo... bagi flat surface biasanya tiada beza. Corrosion rate hampir sama. tp bila ada defect atau large grains size pasti ada point utk corrosion to start. Untuk permukaan tajam atau sharp edges, cone, sini akan berlaku high activities. ie dendrite akan terjadi tempat paling tajam atau paling kecil. sebab itulah electrodeposition jd xrata. ini trjadi sbb sharp edges produces high potential. Harap membantu. Kalu sya xleh jawap nanti saya tanya tokguru besar saya!! (sekarang dok buat haji)
ReplyDeleteJom sapa2 yang lalu page ni...ada experience dan buah fikiran komen2 jom...boleh tengok padangan dari pelbagai perspektif...kongsi2 idea kongsi2 cerita yuk!!!
ReplyDeleteok..should b design kene avoid sharp point and design lebih banyak free form surface..sangat membantu to increase quality of parts.
ReplyDeleteYa. tp tolong tanya orang lain lg, saya bukannya tau sgt. Insya Allah sya carikan rujukan.... bagus juga soalan ni utk sya improve my knowledge. thanks
ReplyDeleteno worries... applied knowledge je...banyak lagi kene rujuk ni..at least dah dapat satu sebab in design..
ReplyDeleteGambaq ni lagi cantek kalau cuba apply rule of thirds masa capture gambaq ni..
ReplyDelete'apply rule of thirds' ni pun xtau, no worries nanti sya tanya expert canon. Thanks bro!
ReplyDeletesaya comment ni from materials engineering point of view la ye: design of product ni ade byk effect cth nya dari segi quality, safety & economic (may be ade few more things but i can just remember this at da moment..hehe..sama2 betulkan ye kalo ade slh slp):
ReplyDeleteQuality ni termasuk la corrosion resistance. if design tu ade sharp edge ini can cause high corrosion rate due to high stress concentration. sharp edge ni weak point. jadi sharp edge will be easily corrode & tends to fail. sharp edge ni jugak akan senang patah disebabkan high stress concentration. So to avoid this design tu mestilah ade certain angle..mesti smooth & rounded corner instead of sharp edge...ade byk lagi aspect quality yg bekaitan..sila refer books la kot..yg ni specific pada corrosion kes saje..in terms of safety of coz rounded corner safer compared to sharp edges (spt yg dinyatakan diatas: mudah patah & gagal...bahaya kpd pengguna gak). in terms of economic, sharp edge require more materials to be used compared to rounded corner (cuba draw if cant imagine), so this is really important issue to engineers. safe the materials seoptimum yg mungkin while maintaining high quality product! materials=cost. kurangkan kos tingkatkan prestasi *eh cam pnh dgr dlm MELODI* hahaha :)
Ok that's all...for more info leh baca buku2 materials design, prevention to corrosion or apa2 buku yg sama waktu dgn nya...
sharing is caring...
~white rose~
Thanx alot ~white rose~ =) Banyak input jugak.. Kepada Dr.Azmin dan ~white rose~...
ReplyDelete- How to determine the residual stress on the workpiece of material??...and
- How it affected the quality of parts?
Measurement - (1) you can use XRD to see if there have different in dhkl. you need to compare with standard sample. (2) you can see using microscope i.e. SEM, some time elongated grains represent the stress layer.
ReplyDeleteAffect? unreleased stress will give many problems. Thanks
Kalau pakai mikroskop optikal untuk tengok elongated grain cukup tak?
ReplyDeletebergantung kepada sampel.... biasa dapat
ReplyDelete~white rose~...mana komen hang
ReplyDeleteoopss sorry ye anonymous..white rose x tau pula ada question from u...ye la ni bukan blog white rose tapi blog Dr Azmin ye...hehe..
ReplyDeleteHmm back 2 da questions...i guess Dr Azmin dah pun jawab..sy cuma nak tambah sikit je kat sini...again as Materials Engineer point of view ye (sy bukan pakar in corrosion as i'm specialized in other field..but i just share some knowledge yg ada je..Dr tlg betulkan sy kalo ada slh slp ye)...
1- to determine residual stress ni ada 2 method; destructive & non-destructive. Mechanical methods or dissection uses the release of stress and its associated strain after doing a cut, hole or crack ( ni cth destrcutive method). while XRD & neutron diffraction pula cth non-destructive & they allows measurement of residual stress in isolated spots. actually design of mechanical part 2 be tested ni penting utk kt plh samada nak guna destructive or non destructive method.
2- Of cozz the quality will be affected by residual stress...sbb commonly residual stress ni visible (distortion, bending, etc.)
pasal type of mikroskop 2 be used pula..depend on ur sample as tok guru sy dah pun jawab...sy cadangkan awak baca buku on materials selection & characterization dan juga mechanical metallurgy 4 more info...
sekian, terima kasih..
~white rose~
orite...thank you ~white rose~...residual stress will give lot of problem and normally the surface with higher hardness compared to the stndard hardness of that material keeping high residual stress also but must be proven by XRD.. =)
ReplyDelete